Browse by Subject

Please select a value to browse from the list below.

Library of Congress Subject Areas (11046)
- A General Works (34)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (3)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (102)
  - B Philosophy (General) (1)
  - BC Logic (1)
  - BF Psychology (36)
  - BJ Ethics (6)
  - BL Religion (1)
  - BP Islam. Bahaism. Theosophy, etc (59)
- D History General and Old World (20)
  - D History (General) (2)
  - DS Asia (18)
- E History America (1)
  - E11 America (General) (1)
- G Geography. Anthropology. Recreation (100)
  - G Geography (General) (48)
    - G100.5 -108.5 Toponymy Including gazetteers, geographic names and terms (4)
    - G149 - 180 Travel. Voyages and travels (General) (29)
      - G154.9 - 155.8 Travel and state. Tourism (24)
    - G70 - 70.6 Philosophy. Relation to other topics. Methodology (7)
  - GA Mathematical geography. Cartography (7)
    - GA101 - 1776 Cartography (6)
  - GB Physical geography (15)
    - GB651 - 2998 Hydrology. Water (8)
      - GB980 - 2998 Ground and surface waters (5)
        GB1201 - 1598 Rivers. Stream measurements (5)
  - GC Oceanography (3)
    - GC1080 - 1581 Marine pollution. Sea water pollution (1)
    - GC150 - 182 Physical oceanography (1)
  - GE Environmental Sciences (11)
    - GE170 - 190 Environmental policy (1)
    - GE70 - 90 Environmental education (5)
  - GN Anthropology (11)
    - GN301 -674 Ethnology. Social and cultural anthropology (8)
      - GN357 -367 Culture and cultural processes Including social change, structuralism, diffusion, etc. (1)
      - GN537 -674 Ethnic groups and races (3)
        GN550 -674 By region or country (1)
  - GV Recreation Leisure (6)
    - GV1 - 1860 Recreation. Leisure (2)
    - GV1469.15 - 1469.62 Computer games. Video games. Fantasy games (2)
- H Social Sciences (911)
  - H Social Sciences (General) (45)
  - HA Statistics (10)
    - HA29-32 Theory and method of social science statistics (3)
    - HA36-37 Statistical services. Statistical bureaus (1)
  - HB Economic Theory (80)
    - HB131-147 Methodology (2)
      - HB135-147 Mathematical economics. Quantitative methods. Including econometrics, input-output analysis, game theory (2)
    - HB221-236 Price (2)
    - HB238-251 Competition. Production. Wealth (1)
    - HB3711-3840 Business cycles. Economic fluctuations (1)
    - HB522-715 Income. Factor shares (58)
      - HB615-715 Entrepreneurship. Risk and uncertainty. Property (51)
    - HB71-74 Economics as a science. Relation to other subjects (5)
    - HB75-130 History of economics. History of economic theory. Including special economic schools (1)
    - HB846-846.8 Welfare theory (1)
  - HC Economic History and Conditions (15)
    - HC79 Special topics. Including air pollution, automation, consumer demand, famines, flow of funds, etc. (8)
    - HC94-1085 By region or country (2)
  - HD Industries. Land use. Labor (390)
    - HD101-1395.5 Land use Land tenure (36)
      - HD1330-1331 Landlord and peasant (1)
      - HD1334-1335 Consolidation of land holdings (1)
      - HD1361-1395.5 Real estate business (21)
    - HD1401-2210 Agriculture (3)
      - HD1635-1702 Utilization and culture of special classes of lands. Including pasture lands, water resources development (1)
    - HD2321-4730.9 Industry (12)
      - HD2329 Industrialization (3)
      - HD2330 Rural industries (1)
      - HD2340.8-2346.5 Small and medium-sized businesses, artisans, handicrafts, trades (1)
    - HD2350.8-2356 Large industry. Factory system. Big business (2)
      - HD2365-2385 Contracting. Letting of contracts (1)
    - HD28-70 Management. Industrial Management (182)
      - HD39-40.7 Capital. Capital investments (1)
      - HD45-45.2 Technological innovations. Automation (43)
      - HD49-49.5 Crisis management. Emergency management. Inflation (2)
      - HD50-50.5 Delegation of authority. Decentralization. Span of control (1)
      - HD56-57.5 Industrial productivity (11)
      - HD58 Location of industry (2)
      - HD58.7-58.95 Organizational behavior, change and effectiveness. Corporate culture (33)
      - HD60-60.5 Social responsibility of business (2)
      - HD61 Risk in industry. Risk management (6)
      - HD62 Standardization. Simplification. Waste (5)
      - HD62.2-62.8 Management of special enterprises (5)
      - HD66-66.2 Work groups. Team work in industry. Quality circles (12)
      - HD69 Other Including business consultants, capacity, size of industries, etc. (1)
    - HD4801-8943 Labor. Work. Working class (102)
      - HD4861-4895 Labor systems (2)
      - HD5106-5267 Hours of labor Including overtime, shift work, sick leave, vacations (3)
      - HD5650-5660 Employee participation in management. Employee ownership. Industrial democracy. Works councils (15)
      - HD5701-6000.9 Labor market. Labor supply. Labor demand Including unemployment, manpower policy, occupational training, employment agencies (15)
      - HD6050-6305 Classes of labor. Including women, children, students, middle-aged and older persons, minorities (5)
      - HD6951-6957 Industrial sociology. Social conditions of labor (3)
      - HD6958.5-6976 Industrial relations (10)
      - HD7255-7256 Vocational rehabilitation. Employment of people with disabilities (1)
      - HD7260-7780.8 Industrial hygiene. Industrial welfare (17)
      - HD7795-8027 Labor policy. Labor and the state (3)
      - HD8038 Professions (General). Professional employees (5)
      - HD8039 By industry or trade (3)
      - HD8045-8943 By region or country (1)
    - HD72-88 Economic growth, development, planning (6)
    - HD9000-9999 Special industries and trades (24)
      - HD9000-9495 Agricultural industries (2)
      - HD9502-9502.5 Energy industries. Energy policy. Fuel trade (2)
      - HD9665-9675 Pharmaceutical industry (1)
      - HD9680-9714 Mechanical industries Including electric utilities, electronic industries, and machinery (1)
      - HD9715-9717.5 Construction industry (7)
      - HD9720-9975 Manufacturing industries (4)
      - HD9999 Miscellaneous industries and trades (1)
  - HE Transportation and Communications (25)
    - HE305-311 Urban transportation (2)
    - HE331-380 Traffic engineering. Roads and highways. Streets (5)
    - HE380.8-971 Water transportation (1)
      - HE380.8-560 Waterways (1)
    - HE5601-5725 Automotive transportation Including trucking, bus lines, and taxicab service (15)
    - HE9761-9900 Air transportation. Airlines (2)
  - HF Commerce (206)
    - HF1021-1027 Commercial geography. Economic geography (1)
    - HF1040-1054 Commodities. Commercial products (2)
    - HF5001-6182 Business (190)
      - HF5381-5386 Vocational guidance. Career development (24)
      - HF5387-5387.5 Business ethics (4)
      - HF5410-5417.5 Marketing. Distribution of products (35)
      - HF5428-5429.6 Retail trade (4)
      - HF5429.7-5430.6 Shopping centers. Shopping malls (1)
      - HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives (2)
      - HF5446-5459 Canvassing. Peddling (1)
      - HF5460-5469.5 Department stores. Mail order business. Supermarkets. Convenience stores (1)
      - HF5469.7-5481 Markets. Fairs (1)
      - HF5520-5541 Office equipment and supplies (2)
      - HF5546-5548.6 Office management (5)
      - HF5548.7-5548.85 Industrial psychology (14)
      - HF5549-5549.5 Personnel management. Employment management (36)
      - HF5601-5689 Accounting. Bookkeeping (11)
      - HF5691-5716 Business mathematics. Commercial arithmetic Including tables, etc. (1)
      - HF5717-5734.7 Business communication Including business report writing, business correspondence (1)
  - HG Finance (64)
    - HG1501-3550 Banking (18)
      - HG1706-1708 Accounting. Bookkeeping (1)
      - HG1709 Data processing (1)
      - HG1811-2351 Special classes of banks and financial institutions (2)
    - HG179 Personal finance (5)
    - HG3691-3769 Credit. Debt. Loans Including credit institutions, credit instruments, consumer credit, bank- ruptcy (2)
    - HG3810-4000 Foreign exchange. International finance. International monetary system (1)
    - HG4001-4285 Finance management. Business finance. Corporation finance (17)
    - HG4501-6051 Investment, capital formation, speculation (5)
    - HG8011-9999 Insurance (1)
  - HJ Public Finance (18)
    - HJ2005-2216 Income and expenditure. Budget (4)
    - HJ2240-5908 Revenue. Taxation. Internal revenue (6)
      - HJ2321-2323 Tax incidence. Tax shifting. Tax equity (1)
    - HJ241-1620 By region or country (2)
    - HJ9103-9695 Local finance. Municipal finance Including the revenue, budget, expenditure, etc. of counties, boroughs, communes, municipalities, etc (4)
  - HM Sociology (22)
    - (HM1-299) These are obsolete numbers no longer used by the Library of Congress (1)
    - HM1001-1281 Social psychology (12)
      - HM1041-1101 Social perception. Social cognition Including perception of the self and others, prejudices, stereotype (5)
      - HM1106-1171 Interpersonal relations. Social behavior (5)
      - HM1176-1281 Social influence. Social pressure (1)
    - HM621-656 Culture (2)
    - HM661-696 Social control (1)
    - HM701 Social systems (2)
    - HM706 Social structure (1)
    - HM711-806 Groups and organizations (1)
      - HM756-781 Community (1)
  - HN Social history and conditions. Social problems. Social reform (6)
    - HN41-46 Community centers. Social centers (1)
  - HQ The family. Marriage. Woman (10)
    - HQ1075-1075.5 Sex role (1)
    - HQ1101-2030.7 Women. Feminism (2)
    - HQ12-449 Sexual life (1)
    - HQ2035-2039 Life skills. Coping skills. Everyday living skills (2)
    - HQ2042-2044 Life style (2)
    - HQ503-1064 The family. Marriage. Home (2)
  - HS Societies secret benevolent etc (1)
    - HS1501-2460.7 Other societies. By classes (1)
      - HS1525-1560 Religious societies (1)
  - HT Communities. Classes. Races (27)
    - HT101-395 Urban groups. The city. Urban sociology (17)
      - HT165.5-169.9 City planning (3)
      - HT170-178 Urban renewal. Urban redevelopment (5)
      - HT231 Effect of city life (1)
      - HT251-265 Mental and moral life (1)
      - HT321-325 The city as an economic factor. City promotion (1)
      - HT361-384 Urbanization. City and country (1)
    - HT51-65 Human settlements. Communities (3)
    - HT601-1445 Classes (1)
      - HT621-635 Origin of social classes (1)
  - HV Social pathology. Social and public welfare (26)
    - HV40-69 Social service. Social work. Charity organization and practice Including social case work, private and public relief, institutional care, rural social work, work relief (3)
    - HV551.2-639 Emergency management (3)
      - HV553-639 Relief in case of disasters (2)
    - HV5800-5840 Drug habits. Drug abuse (2)
    - HV675-677 Accidents. Prevention of accidents (1)
    - HV697-4959 Protection, assistance and relief (7)
      - HV697-3024 Special classes (1)
        HV1551-3024 People with disabilities Including blind, deaf, ¬people with physical and mental disabilities (1)
    - HV7231-9960 Criminal justice administration (7)
      - HV7431 Prevention of crime, methods, etc. (2)
      - HV7551-8280.7 Police. Detectives. Constabulary (4)
        HV8031-8080 Police duty. Methods of protection (4)
        HV8073-8079.35 Investigation of crimes. Examination and identification of prisoners (1)
        HV8079.5-8079.55 Traffic control. Traffic accident investigation (3)
      - HV8290-8291 Private security services (1)
- J Political Science (12)
  - JA Political science (General) (2)
  - JF Political institutions (General) (2)
  - JQ Political institutions Asia (4)
  - JS Local government Municipal government (3)
  - JZ International relations (1)
- L Education (1084)
  - L Education (General) (72)
    - L7-97 Periodicals. Societies (10)
    - L899 School fairs (1)
  - LA History of education (4)
    - LA410-2284 Other regions or countries (3)
  - LB Theory and practice of education (822)
    - LB1025-1050.75 Teaching (Principles and practice) (302)
    - LB1050.9-1091 Educational psychology (135)
    - LB1140-1140.5 Preschool education. Nursery schools (2)
    - LB1141-1489 Kindergarten (2)
    - LB1501-1547 Primary education (9)
    - LB1555-1602 Elementary or public school education (13)
    - LB1603-1696.6 Secondary education. High schools (11)
    - LB1705-2286 Education and training of teachers and administrators (56)
      - LB1775-1785 Professional aspects of teaching and school administrators. Vocational guidance (11)
      - LB2165-2278 Teacher training in universities and colleges (5)
    - LB2300-2430 Higher education (154)
      - LB2326.4-2330 Institutions of higher education (28)
      - LB2331.7-2335.8 Teaching personnel (6)
      - LB2341-2341.95 Supervision and administration. Business management (4)
      - LB2351-2359 Admissions and entrance requirements (2)
      - LB2361-2365 Curriculum (8)
      - LB2371-2372 Graduate education (6)
      - LB2381-2391 Academic degrees (1)
    - LB2799-2799.3 Educational consultants and consulting (8)
    - LB2801-3095 School administration and organization (49)
      - LB2831.6-2831.99 Administrative personnel (2)
      - LB2832-2844.1 Teaching personnel (9)
      - LB3011-3095 School management and discipline (8)
        LB3050-3060.87 Educational tests, measurements, evaluations and examinations (7)
    - LB3201-3325 School architecture and equipment. School physical facilities. Campus planning (12)
    - LB3401-3495 School hygiene. School health services (3)
    - LB3497-3499 Hygiene in universities and colleges (1)
    - LB3602-3640 School life. Student manners and customs (9)
    - LB5-45 General' (2)
  - LC Special aspects of education (210)
    - LC1200-1203 Inclusive education (1)
    - LC1390-5160.3 Education of special classes of persons (9)
    - LC251-951 Moral and religious education (7)
      - LC251-318 Moral education. Character building (1)
      - LC321-951 Religion and education. Education under church control (2)
        LC901-915 Islamic education (2)
    - LC5161-5163 Fundamental education (1)
    - LC5201-6660.4 Education extension. Adult education. Continuing education (20)
      - LC5451-5493 Aged education (3)
      - LC5800-5808 Distance education (2)
    - LC65-245 Social aspects of education (16)
      - LC142-148.5 Attendance. Dropouts (1)
      - LC165-182 Higher education and the state (1)
      - LC189-214.53 Educational sociology (6)
        LC212-212.863 Discrimination in education (3)
        LC212.9-212.93 Sex differences in education (1)
      - LC215-238.4 Community and the school (2)
        LC237-238.4 College-university and the community (2)
    - LC8-59 Forms of education (4)
      - LC15 Conversation and culture (1)
      - LC37-44.3 Home education (1)
      - LC45-45.8 Nonformal education (1)
    - LC980-1099.5 Types of education (138)
      - LC1025-1027 Collective education (1)
      - LC1031-1034.5 Competency based education (1)
      - LC1035-1035.8 Basic education. Basic skills education (1)
      - LC1037-1037.8 Career education (13)
      - LC1041-1048 Vocational education (General) (59)
      - LC1049-1049.8 Cooperative education (1)
      - LC1051-1072 Professional education (22)
  - LD Individual institutions (United States) (2)
    - LD13-7501 United States (2)
      - LD13-7251 Universities. Colleges (1)
        LD6501 Community colleges. Junior colleges (1)
      - LD7501 Secondary and elementary schools (1)
  - LG Individual institutions (Asia. Africa) (4)
    - LG21-395 Asia (4)
      - LG173 Malaysia (3)
      - LG359 Saudi Arabia (1)
  - LT Textbooks (2)
- N Fine Arts (24)
  - NA Architecture (10)
  - ND Painting (1)
  - NK Decorative arts Applied arts Decoration and ornament (13)
- P Language and Literature (25)
  - P Philology. Linguistics (6)
    - P1 - 85 General (1)
    - P87 - 96 Communication. Mass media (1)
    - P94.7 Interpersonal communication (1)
    - P98 - 98.5 Computational linguistics. Natural language processing (1)
  - PE English (13)
    - PE1-3729 English (6)
    - PE1001-1693 Modern English (2)
  - PJ Semitic (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (1)
  - PN Literature (General) (4)
    - PN1010-1525 Poetry (1)
    - PN4001-4355 Oratory. Elocution, etc. (1)
    - PN4177-4191 Debating (1)
    - PN4775-4784 Technique. Practical journalism (1)
- Q Science (905)
  - Q Science (General) (51)
    - Q1-295 General (10)
    - Q300-390 Cybernetics (11)
      - Q350-390 Information theory (5)
  - QA Mathematics (520)
    - QA1-43 General (12)
    - QA101-(145) Elementary mathematics. Arithmetic (3)
    - QA150-272.5 Algebra (19)
    - QA273-280 Probabilities. Mathematical statistics (57)
    - QA299.6-433 Analysis (47)
    - QA71-90 Instruments and machines (135)
      - QA75-76.95 Calculating machines (27)
      - QA76.75-76.765 Computer software (19)
    - QA75 Electronic computers. Computer science (51)
    - QA76 Computer software (170)
    - QA801-939 Analytic mechanics (20)
  - QB Astronomy (10)
    - QB495-903 Descriptive astronomy (8)
      - QB500.5-785 Solar system (8)
    - QB980-991 Cosmogony. Cosmology (1)
  - QC Physics (140)
    - QC1-75 General (1)
    - QC120-168.85 Descriptive and experimental mechanics (1)
    - QC170-197 Atomic physics. Constitution and properties of matter. Including molecular physics, relativity, quantum theory, and solid state physics (24)
    - QC221-246 Acoustics. Sound (5)
    - QC251-338.5 Heat (15)
    - QC350-467 Optics. Light (6)
    - QC474-496.9 Radiation physics (General) (4)
    - QC501-766 Electricity and magnetism (30)
      - QC501-(721) Electricity (7)
        QC669-675.8 Electromagnetic theory (1)
        QC676-678.6 Radio waves (Theory) (2)
        QC717.6-718.8 Plasma physics. Ionized gases (1)
      - QC750-766 Magnetism (2)
    - QC770-798 Nuclear and particle physics. Atomic energy. Radioactivity (5)
      - QC794.95-798 Radioactivity and radioactive substances (1)
    - QC801-809 Geophysics. Cosmic physics (2)
    - QC851-999 Meteorology. Climatology. Including the earth's atmosphere (16)
      - QC980-999 Climatology and weather (4)
        QC994.95-999 Weather forecasting (1)
  - QD Chemistry (61)
    - QD1-65 General. Including alchemy (1)
    - QD146-197 Inorganic chemistry (11)
    - QD241-441 Organic chemistry (7)
    - QD450-801 Physical and theoretical chemistry (12)
    - QD71-142 Analytical chemistry (3)
  - QE Geology (14)
    - QE351-399.2 Mineralogy (5)
    - QE500-639.5 Dynamic and structural geology (2)
      - QE521-545 Volcanoes and earthquakes (1)
    - QE701-760 Paleontology (2)
    - QE760.8-899.2 Paleozoology (1)
  - QH Natural history (37)
    - QH1-(199.5) General.Including nature conservation, geographical distribution (4)
    - QH201-278.5 Microscopy (1)
    - QH301 Biology (16)
      - QH426-470 Genetics (2)
      - QH501-531 Life (2)
      - QH540-549.5 Ecology (3)
      - QH573-671 Cytology (5)
  - QK Botany (20)
    - QK1-474.5 General. Including geographical distribution (1)
    - QK710-899 Plant physiology (1)
  - QL Zoology (23)
    - QL1-355 General. Including geographical distribution (1)
    - QL360-599.82 Invertebrates (13)
      - QL461-599.82 Insects (11)
    - QL605-739.8 Chordates. Vertebrates (5)
      - QL614-639.8 Fishes (1)
      - QL640-669.3 Reptiles and amphibians (1)
      - QL671-699 Birds (2)
  - QP Physiology (20)
    - QP1-345 Physiology General (5)
    - QP351-495 Neurophysiology and neuropsychology (5)
    - QP501-801 Animal biochemistry (9)
  - QR Microbiology (15)
    - QR355 Virology (1)
- R Medicine (202)
  - R Medicine (General) (100)
    - R131-687 History of medicine. Medical expeditions (2)
    - R5-130.5 General works (3)
    - R702-703 Medicine and the humanities. Medicine and disease in relation to history, literature, etc. (2)
    - R735-854 Medical education. Medical schools. Research (1)
    - R855-855.5 Medical technology (38)
    - R856-857 Biomedical engineering. Electronics. Instrumentation (26)
    - R858-859.7 Computer applications to medicine. Medical informatics (3)
  - RA Public aspects of medicine (17)
    - RA0421 Public health. Hygiene. Preventive Medicine (7)
      - RA643-645 Disease (Communicable and noninfectious) and public health (2)
      - RA773-788 Personal health and hygiene Including clothing, bathing, exercise, travel, nutrition, sleep, sex hygiene (1)
      - RA790-790.95 Mental health. Mental illness prevention (1)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
    - RA1190-1270 Toxicology. Poisons (1)
    - RA791-954 Medical geography. Climatology. Meteorology (1)
  - RB Pathology (1)
  - RC Internal medicine (54)
    - RC109-216 Infectious and parasitic diseases (1)
    - RC306-320.5 Tuberculosis (3)
    - RC346-429 Neurology. Diseases of the nervous system Including speech disorders (5)
      - RC435-571 Psychiatry (5)
        RC475-489 Therapeutics. Psychotherapy (1)
        RC512-569.5 Psychopathology (2)
        RC512-528 Psychoses (1)
        RC530-552 Neuroses (1)
    - RC581-951 Specialties of internal medicine (12)
      - RC666-701 Diseases of the circulatory (Cardiovascular) system (3)
      - RC924-924.5 Diseases of the connective tissues (1)
      - RC925-935 Diseases of the musculoskeletal system (1)
    - RC71-78.7 Examination. Diagnosis Including radiography (4)
  - RD Surgery (12)
    - RD130 Prosthesis. Artificial organs (1)
    - RD63-76 Operating rooms and theaters. Instruments, apparatus, and appliances (1)
    - RD680-688 Diseases of the locomotor system (Surgical treatment) (2)
    - RD701-811 Orthopedic surgery (3)
  - RE Ophthalmology (2)
    - RE91-912 Particular diseases of the eye (1)
    - RE925-939 Refraction and errors of refraction and accommodation (1)
  - RG Gynecology and obstetrics (3)
    - RG500-991 Obstetrics (1)
      - RG801-871 Puerperal state (1)
  - RJ Pediatrics (1)
    - RJ370-550 Diseases of children and adolescents (1)
  - RK Dentistry (1)
  - RL Dermatology (1)
    - RL110-120 Therapeutics (1)
  - RM Therapeutics. Pharmacology (5)
    - RM300-666 Drugs and their actions (1)
    - RM695-893 Physical medicine. Physical therapy Including massage, exercise, occupational therapy, hydrotherapy, phototherapy, radiotherapy, thermotherapy, electrotherapy (2)
    - RM930-931 Rehabilitation therapy (1)
  - RS Pharmacy and materia medica (4)
    - RS153-441 Materia medica (1)
  - RV Botanic, Thomsonian, and eclectic medicine (3)
  - RZ Other systems of medicine (2)
    - RZ400-408 Mental healing (1)
- S Agriculture (58)
  - S Agriculture (General) (18)
    - S403 Agricultural missions, voyages, etc. (1)
    - S583 -587.73 Agricultural chemistry. Agricultural chemicals (1)
    - S671 -760.5 Farm machinery and farm engineering (1)
  - SB Plant culture (25)
    - SB183 -317 Field crops Including cereals, forage crops, grasses, legumes, root crops, sugar plants, textile plants, alkaloidal plants, medicinal plants (1)
    - SB317.5 -319.864 Horticulture. Horticultural crops (1)
    - SB320 -353.5 Vegetables (1)
    - SB354 -402 Fruit and fruit culture (4)
      - SB381 -386 Berries and small fruits (1)
    - SB469 -(476.4) Landscape gardening. Landscape architecture (2)
    - SB599 -990.5 Pests and diseases (2)
      - SB608 Individual or types of plants or trees (1)
  - SD Forestry (2)
    - SD391 -410.9 Sylviculture (1)
    - SD411 -428 Conservation and protection Including forest influences, damage by elements, fires, forest reserves (1)
  - SF Animal culture (5)
    - SF380-388 Goats (1)
    - SF481 -507 Poultry. Eggs (1)
    - SF515 -515.5 Reptiles (1)
    - SF518 Insect rearing (1)
  - SH Aquaculture. Fisheries. Angling (8)
    - SH20.3 -191 Aquaculture (1)
    - SH201 -399 Fisheries (3)
      - SH328-329 Fishery management. Fishery policy (2)
      - SH334 Economic aspects. Finance (1)
- T Technology (8107)
  - T Technology (General) (3891)
    - T10.5-11.9 Communication of technical information (22)
    - T11.95-12.5 Industrial directories (145)
      - T55-55.3 Industrial safety. Industrial accident prevention (33)
      - T58.4 Managerial control systems (2)
      - T58.5-58.64 Information technology (74)
      - T58.6-58.62 Management information systems (27)
      - T59.5 Automation (1)
      - T59.7-59.77 Human engineering in industry. Man-machine systems (5)
      - T60-60.8 Work measurement. Methods engineering (5)
    - T173.2-174.5 Technological change (27)
    - T175-178 Industrial research. Research and development (40)
    - T201-342 Patents. Trademarks (10)
    - T351-385 Mechanical drawing. Engineering graphics (12)
    - T55.4-60.8 Industrial engineering. Management engineering (52)
      - T57-57.97 Applied mathematics. Quantitative methods (19)
        T57.6-57.97 Operations research. Systems analysis (15)
    - T61-173 Technical education. Technical schools (69)
  - TA Engineering (General). Civil engineering (General) (994)
    - TA1001-1280 Transportation engineering (4)
    - TA1501-1820 Applied optics. Photonics (73)
    - TA164 Bioengineering (16)
    - TA165 Engineering instruments, meters, etc. Industrial instrumentation (19)
    - TA166-167 Human engineering (12)
    - TA168 Systems engineering (50)
    - TA170-171 Environmental engineering (60)
    - TA174 Engineering design (29)
    - TA177.4-185 Engineering economy (3)
    - TA190-194 Management of engineering works (12)
    - TA2001-2040 Plasma engineering. Applied plasma dynamics (1)
    - TA213-215 Engineering machinery, tools, and implements (10)
    - TA329-348 Engineering mathematics. Engineering analysis (34)
    - TA349-359 Mechanics of engineering. Applied mechanics (29)
    - TA365-367 Acoustics in engineering. Acoustical engineering (6)
    - TA401-492 Materials of engineering and construction. Mechanics of materials (383)
    - TA495 Disasters and engineering (5)
    - TA501-625 Surveying (12)
    - TA630-695 Structural engineering (General) (52)
    - TA703-712 Engineering geology. Rock mechanics. Soil mechanics. (49)
    - TA715-787 Earthwork. Foundations (14)
    - TA800-820 Tunneling. Tunnels (2)
  - TC Hydraulic engineering. Ocean engineering (49)
    - TC1501-1800 Ocean engineering (3)
    - TC160-181 Technical hydraulics (6)
    - TC183-201 General preliminary operations. Dredging. Submarine building (2)
    - TC401-506 River, lake, and water-supply engineering (General) (5)
    - TC530-537 River protective works. Regulation. Flood control (11)
    - TC540-558 Dams. Barrages (2)
    - TC801-978 Irrigation engineering. Reclamation of wasteland. Drainage (1)
  - TD Environmental technology. Sanitary engineering (472)
    - TD1020-1066 Hazardous substances and their disposal (2)
    - TD159-168 Municipal engineering (8)
    - TD169-171.8 Environmental protection (9)
    - TD172-193.5 Environmental pollution (24)
    - TD194-195 Environmental effects of industries and plants (16)
    - TD201-500 Water supply for domestic and industrial purposes (149)
      - TD419-428 Water pollution (20)
      - TD429.5-480.7 Water purification. Water treatment and conditioning. Saline water conversion (75)
      - TD481-493 Water distribution systems (4)
    - TD511-780 Sewage collection and disposal systems. Sewerage (35)
    - TD783-812.5 Municipal refuse. Solid wastes (50)
    - TD878-894 Special types of environment, Including soil pollution, air pollution, noise pollution (54)
    - TD895-899 Industrial and factory sanitation (17)
      - TD896-899 Industrial and factory wastes (9)
    - TD920-934 Rural and farm sanitary engineering (1)
  - TE Highway engineering. Roads and pavements (87)
    - TE175-176.5 Highway design. Interchanges and intersections (4)
    - TE177-178.8 Roadside development. Landscaping (3)
    - TE200-205 Materials for roadmaking (3)
    - TE206-209.5 Location engineering (1)
    - TE210-228.3 Construction details. Including foundations, maintenance, equipment (16)
    - TE250-278.8 Pavements and paved roads (37)
    - TE279 Streets (1)
    - TE279.5-298 Pedestrian facilities (2)
  - TF Railroad engineering and operation (16)
    - TF200-320 Railway construction (5)
    - TF501-668 Railway operation and management (1)
  - TG Bridge engineering (2)
  - TH Building construction (432)
    - TH1000-1725 Systems of building construction. Including fireproof construction, concrete construction (168)
    - TH2025-3000 Details in building design and construction. Including walls, roofs (14)
    - TH3301-3411 Maintenance and repair (14)
    - TH4021-4977 Buildings: Construction with reference to use. Including public buildings, dwellings (23)
    - TH5011-5701 Construction by phase of the work (Building trades) (13)
    - TH6014-6081 Environmental engineering of buildings. Sanitary engineering of buildings (16)
    - TH7005-7699 Heating and ventilation. Air conditioning (39)
    - TH7700-7975 Illumination. Lighting (1)
    - TH8001-8581 Decoration and decorative furnishings (4)
      - TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary (1)
    - TH845-895 Architectural engineering. Structural engineering of buildings (10)
    - TH900-915 Construction equipment in building (7)
    - TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary (6)
  - TJ Mechanical engineering and machinery (717)
    - TJ1040-1119 Machinery exclusive of prime movers (24)
    - TJ1125-1345 Machine shops and machine shop practice (61)
    - TJ1350-1418 Hoisting and conveying machinery (2)
    - TJ1480-1496 Agricultural machinery. Farm machinery (8)
    - TJ163.13-163.25 Power resources (16)
    - TJ163.26-163.5 Energy conservation (20)
    - TJ170-179 Mechanics applied to machinery. Dynamics (16)
    - TJ181-210 Mechanical movements (9)
    - TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General) (103)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (74)
    - TJ227-240 Machine design and drawing (11)
    - TJ241-254.7 Machine construction (General) (18)
    - TJ255-265 Heat engines (26)
    - TJ266-267.5 Turbines. Turbomachines (General) (17)
    - TJ268-740 Steam engineering (4)
    - TJ751-805 Miscellaneous motors and engines Including gas, gasoline, diesel engines (37)
    - TJ807-830 Renewable energy sources (38)
    - TJ836-927 Hydraulic machinery (10)
    - TJ950-1030 Pneumatic machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (1181)
    - TK1001-1841 Production of electric energy or power. Powerplants. Central stations (107)
    - TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers (96)
    - TK2896-2985 Production of electricity by direct energy conversion (40)
    - TK3001-3521 Distribution or transmission of electric power (73)
    - TK301-399 Electric meters (6)
    - TK4001-4102 Applications of electric power (11)
    - TK4125-4399 Electric lighting (7)
    - TK452-454.4 Electric apparatus and materials. Electric circuits. Electric networks (41)
    - TK4601-4661 Electric heating (2)
    - TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television (290)
    - TK7800-8360 Electronics (424)
      - TK7885-7895 Computer engineering. Computer hardware (38)
      - TK8300-8360 Photoelectronic devices (General) (3)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
    - TK9900-9971 Electricity for amateurs. Amateur constructors' manuals (1)
  - TL Motor vehicles. Aeronautics. Astronautics (122)
    - TL1-484 Motor vehicles. Cycles (58)
    - TL500-777 Aeronautics. Aeronautical engineering (39)
  - TN Mining engineering. Metallurgy (29)
    - TN600-799 Metallurgy (19)
    - TN799.5-948 Nonmetallic minerals (2)
  - TP Chemical technology (519)
    - TP1080-1185 Polymers and polymer manufacture (72)
    - TP155-156 Chemical engineering (71)
    - TP200-248 Chemicals: Manufacture, use, etc. (42)
    - TP248.13-248.65 Biotechnology (54)
    - TP250-261 Industrial electrochemistry (6)
    - TP315-360 Fuel (83)
    - TP368-456 Food processing and manufacture (20)
    - TP480-498 Low temperature engineering. Cryogenic engineering. Refrigeration (2)
    - TP500-660 Fermentation industries. Beverages. Alcohol (4)
    - TP670-699 Oils, fats, and waxes (10)
      - TP690-692.5 Petroleum refining. Petroleum products (1)
    - TP751-762 Gas industry (3)
    - TP785-869 Clay industries. Ceramics. Glass (12)
    - TP875-888 Cement industries (3)
    - TP890-933 Textile bleaching, dyeing, printing, etc. (2)
    - TP934-945 Paints, pigments, varnishes, etc. (2)
  - TR Photography (6)
    - TR287-500 Photographic processing. Darkroom technique (1)
    - TR624-835 Applied photography. Including artistic, commercial, medical photography, photocopying processes (4)
    - TR845-899 Cinematography. Motion pictures (1)
  - TS Manufactures (299)
    - TS1080-1268 Paper manufacture and trade (13)
    - TS1300-1865 Textile industries (17)
    - TS155-194 Production management. Operations management (160)
    - TS1870-1935 Rubber industry (2)
    - TS195-198.8 Packaging (2)
    - TS1950-1982 Animal products (2)
    - TS200-770 Metal manufactures. Metalworking (49)
    - TS2284-2288 Animal feeds and feed mills. Pet food industry (1)
    - TS800-937 Wood technology. Lumber (11)
      - TS840-915 Wood products. Furniture (4)
      - TS920-937 Chemical processing of wood (1)
  - TT Handicrafts Arts and crafts (4)
    - TT180-200 Woodworking. Furniture making. Upholstering (1)
    - TT490-695 Clothing manufacture. Dressmaking. Tailoring (2)
  - TX Home economics (35)
    - TX301-339 The house. Including arrangement, care, servants (2)
    - TX341-641 Nutrition. Foods and food supply (15)
    - TX901-946.5 Hospitality industry. Hotels, clubs, restaurants, etc. Food service (15)
    - TX955-985 Building operation and housekeeping (1)
- U Military Science (6)
  - UA10 - 997 Armies: Organization, distribution, military situation (1)
  - UG622 - 1435 Air forces. Air warfare (5)
    - UG1100 - 1435 Equipment and supplies (1)
- V Naval Science (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (10)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (3)
  - Z719 Libraries (General) (2)
  - ZA Information resources (2)
    - ZA4050 Electronic information resources (1)