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Library of Congress Subject Areas (1902)
- B Philosophy. Psychology. Religion (31)
  - BF Psychology (15)
  - BJ Ethics (3)
  - BP Islam. Bahaism. Theosophy, etc (13)
- D History General and Old World (2)
  - DS Asia (2)
- E History America (1)
  - E11 America (General) (1)
- G Geography. Anthropology. Recreation (20)
  - G Geography (General) (5)
    - G149 - 180 Travel. Voyages and travels (General) (1)
      - G154.9 - 155.8 Travel and state. Tourism (1)
    - G70 - 70.6 Philosophy. Relation to other topics. Methodology (2)
  - GB Physical geography (3)
    - GB651 - 2998 Hydrology. Water (1)
      - GB980 - 2998 Ground and surface waters (1)
        GB1201 - 1598 Rivers. Stream measurements (1)
  - GC Oceanography (2)
    - GC150 - 182 Physical oceanography (1)
  - GE Environmental Sciences (3)
    - GE170 - 190 Environmental policy (1)
  - GN Anthropology (6)
    - GN301 -674 Ethnology. Social and cultural anthropology (6)
      - GN357 -367 Culture and cultural processes Including social change, structuralism, diffusion, etc. (1)
      - GN537 -674 Ethnic groups and races (2)
  - GV Recreation Leisure (1)
- H Social Sciences (187)
  - H Social Sciences (General) (3)
  - HA Statistics (1)
    - HA29-32 Theory and method of social science statistics (1)
  - HB Economic Theory (17)
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      - HB135-147 Mathematical economics. Quantitative methods. Including econometrics, input-output analysis, game theory (1)
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      - HB615-715 Entrepreneurship. Risk and uncertainty. Property (11)
  - HC Economic History and Conditions (5)
    - HC79 Special topics. Including air pollution, automation, consumer demand, famines, flow of funds, etc. (3)
    - HC94-1085 By region or country (1)
  - HD Industries. Land use. Labor (86)
    - HD101-1395.5 Land use Land tenure (6)
      - HD1330-1331 Landlord and peasant (1)
      - HD1361-1395.5 Real estate business (2)
    - HD2321-4730.9 Industry (5)
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    - HD28-70 Management. Industrial Management (34)
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      - HD50-50.5 Delegation of authority. Decentralization. Span of control (1)
      - HD56-57.5 Industrial productivity (3)
      - HD58.7-58.95 Organizational behavior, change and effectiveness. Corporate culture (5)
      - HD60-60.5 Social responsibility of business (2)
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    - HD4801-8943 Labor. Work. Working class (16)
      - HD5650-5660 Employee participation in management. Employee ownership. Industrial democracy. Works councils (1)
      - HD5701-6000.9 Labor market. Labor supply. Labor demand Including unemployment, manpower policy, occupational training, employment agencies (4)
      - HD6951-6957 Industrial sociology. Social conditions of labor (1)
      - HD7260-7780.8 Industrial hygiene. Industrial welfare (3)
      - HD7795-8027 Labor policy. Labor and the state (2)
      - HD8038 Professions (General). Professional employees (1)
    - HD72-88 Economic growth, development, planning (1)
    - HD9000-9999 Special industries and trades (8)
      - HD9000-9495 Agricultural industries (1)
      - HD9502-9502.5 Energy industries. Energy policy. Fuel trade (1)
      - HD9715-9717.5 Construction industry (2)
  - HE Transportation and Communications (4)
    - HE331-380 Traffic engineering. Roads and highways. Streets (3)
    - HE5601-5725 Automotive transportation Including trucking, bus lines, and taxicab service (1)
  - HF Commerce (41)
    - HF5001-6182 Business (35)
      - HF5381-5386 Vocational guidance. Career development (7)
      - HF5387-5387.5 Business ethics (1)
      - HF5410-5417.5 Marketing. Distribution of products (6)
      - HF5437-5444 Purchasing. Selling. Sales personnel. Sales executives (1)
      - HF5546-5548.6 Office management (2)
      - HF5548.7-5548.85 Industrial psychology (3)
      - HF5549-5549.5 Personnel management. Employment management (10)
      - HF5601-5689 Accounting. Bookkeeping (1)
  - HG Finance (20)
    - HG1501-3550 Banking (5)
      - HG1706-1708 Accounting. Bookkeeping (1)
      - HG1709 Data processing (1)
    - HG179 Personal finance (1)
    - HG3691-3769 Credit. Debt. Loans Including credit institutions, credit instruments, consumer credit, bank- ruptcy (1)
    - HG3810-4000 Foreign exchange. International finance. International monetary system (1)
    - HG4001-4285 Finance management. Business finance. Corporation finance (5)
    - HG8011-9999 Insurance (1)
  - HJ Public Finance (4)
    - HJ2005-2216 Income and expenditure. Budget (1)
    - HJ2240-5908 Revenue. Taxation. Internal revenue (2)
    - HJ9103-9695 Local finance. Municipal finance Including the revenue, budget, expenditure, etc. of counties, boroughs, communes, municipalities, etc (1)
  - HM Sociology (3)
    - HM1001-1281 Social psychology (1)
  - HT Communities. Classes. Races (2)
    - HT101-395 Urban groups. The city. Urban sociology (1)
      - HT165.5-169.9 City planning (1)
  - HV Social pathology. Social and public welfare (4)
    - HV551.2-639 Emergency management (1)
      - HV553-639 Relief in case of disasters (1)
    - HV7231-9960 Criminal justice administration (2)
      - HV7551-8280.7 Police. Detectives. Constabulary (1)
        HV8031-8080 Police duty. Methods of protection (1)
        HV8073-8079.35 Investigation of crimes. Examination and identification of prisoners (1)
      - HV8290-8291 Private security services (1)
- J Political Science (2)
  - JF Political institutions (General) (1)
  - JQ Political institutions Asia (1)
- L Education (169)
  - L Education (General) (3)
  - LB Theory and practice of education (148)
    - LB1025-1050.75 Teaching (Principles and practice) (52)
    - LB1050.9-1091 Educational psychology (29)
    - LB1501-1547 Primary education (2)
    - LB1555-1602 Elementary or public school education (6)
    - LB1603-1696.6 Secondary education. High schools (2)
    - LB1705-2286 Education and training of teachers and administrators (5)
      - LB1775-1785 Professional aspects of teaching and school administrators. Vocational guidance (2)
      - LB2165-2278 Teacher training in universities and colleges (1)
    - LB2300-2430 Higher education (18)
      - LB2326.4-2330 Institutions of higher education (4)
      - LB2331.7-2335.8 Teaching personnel (2)
      - LB2361-2365 Curriculum (1)
      - LB2371-2372 Graduate education (3)
      - LB2381-2391 Academic degrees (1)
    - LB2801-3095 School administration and organization (9)
      - LB2831.6-2831.99 Administrative personnel (1)
      - LB2832-2844.1 Teaching personnel (5)
    - LB3201-3325 School architecture and equipment. School physical facilities. Campus planning (3)
    - LB3602-3640 School life. Student manners and customs (1)
    - LB5-45 General' (1)
  - LC Special aspects of education (20)
    - LC1390-5160.3 Education of special classes of persons (1)
    - LC251-951 Moral and religious education (1)
    - LC65-245 Social aspects of education (1)
      - LC215-238.4 Community and the school (1)
        LC237-238.4 College-university and the community (1)
    - LC980-1099.5 Types of education (11)
      - LC1031-1034.5 Competency based education (1)
      - LC1037-1037.8 Career education (3)
      - LC1041-1048 Vocational education (General) (3)
      - LC1051-1072 Professional education (2)
- N Fine Arts (1)
  - NA Architecture (1)
- P Language and Literature (3)
  - PE English (1)
  - PJ Semitic (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (1)
- Q Science (297)
  - Q Science (General) (11)
    - Q1-295 General (3)
    - Q300-390 Cybernetics (3)
  - QA Mathematics (156)
    - QA1-43 General (1)
    - QA150-272.5 Algebra (4)
    - QA273-280 Probabilities. Mathematical statistics (14)
    - QA299.6-433 Analysis (9)
    - QA71-90 Instruments and machines (52)
      - QA75-76.95 Calculating machines (18)
      - QA76.75-76.765 Computer software (9)
    - QA75 Electronic computers. Computer science (2)
    - QA76 Computer software (59)
    - QA801-939 Analytic mechanics (8)
  - QB Astronomy (1)
  - QC Physics (44)
    - QC170-197 Atomic physics. Constitution and properties of matter. Including molecular physics, relativity, quantum theory, and solid state physics (14)
    - QC221-246 Acoustics. Sound (4)
    - QC251-338.5 Heat (5)
    - QC350-467 Optics. Light (3)
    - QC501-766 Electricity and magnetism (9)
      - QC501-(721) Electricity (2)
        QC669-675.8 Electromagnetic theory (1)
        QC717.6-718.8 Plasma physics. Ionized gases (1)
    - QC770-798 Nuclear and particle physics. Atomic energy. Radioactivity (1)
    - QC801-809 Geophysics. Cosmic physics (2)
    - QC851-999 Meteorology. Climatology. Including the earth's atmosphere (1)
  - QD Chemistry (24)
    - QD1-65 General. Including alchemy (1)
    - QD146-197 Inorganic chemistry (7)
    - QD241-441 Organic chemistry (4)
    - QD450-801 Physical and theoretical chemistry (4)
    - QD71-142 Analytical chemistry (2)
  - QE Geology (6)
    - QE351-399.2 Mineralogy (3)
    - QE500-639.5 Dynamic and structural geology (1)
    - QE701-760 Paleontology (1)
    - QE760.8-899.2 Paleozoology (1)
  - QH Natural history (22)
    - QH1-(199.5) General.Including nature conservation, geographical distribution (1)
    - QH301 Biology (7)
      - QH540-549.5 Ecology (1)
      - QH573-671 Cytology (3)
  - QK Botany (7)
    - QK1-474.5 General. Including geographical distribution (1)
  - QL Zoology (11)
    - QL360-599.82 Invertebrates (8)
      - QL461-599.82 Insects (7)
    - QL605-739.8 Chordates. Vertebrates (2)
      - QL640-669.3 Reptiles and amphibians (1)
  - QP Physiology (9)
    - QP1-345 Physiology General (1)
    - QP351-495 Neurophysiology and neuropsychology (3)
    - QP501-801 Animal biochemistry (4)
  - QR Microbiology (6)
- R Medicine (52)
  - R Medicine (General) (19)
    - R856-857 Biomedical engineering. Electronics. Instrumentation (3)
  - RA Public aspects of medicine (3)
    - RA0421 Public health. Hygiene. Preventive Medicine (2)
      - RA643-645 Disease (Communicable and noninfectious) and public health (1)
  - RC Internal medicine (19)
    - RC306-320.5 Tuberculosis (1)
    - RC581-951 Specialties of internal medicine (3)
      - RC666-701 Diseases of the circulatory (Cardiovascular) system (1)
    - RC71-78.7 Examination. Diagnosis Including radiography (2)
  - RD Surgery (6)
    - RD701-811 Orthopedic surgery (1)
  - RJ Pediatrics (1)
    - RJ370-550 Diseases of children and adolescents (1)
  - RM Therapeutics. Pharmacology (2)
    - RM695-893 Physical medicine. Physical therapy Including massage, exercise, occupational therapy, hydrotherapy, phototherapy, radiotherapy, thermotherapy, electrotherapy (1)
    - RM930-931 Rehabilitation therapy (1)
  - RS Pharmacy and materia medica (2)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
- S Agriculture (18)
  - S Agriculture (General) (4)
    - S403 Agricultural missions, voyages, etc. (1)
    - S671 -760.5 Farm machinery and farm engineering (1)
  - SB Plant culture (7)
  - SD Forestry (1)
    - SD411 -428 Conservation and protection Including forest influences, damage by elements, fires, forest reserves (1)
  - SF Animal culture (1)
    - SF481 -507 Poultry. Eggs (1)
  - SH Aquaculture. Fisheries. Angling (5)
    - SH20.3 -191 Aquaculture (1)
    - SH201 -399 Fisheries (1)
- T Technology (1149)
  - T Technology (General) (36)
    - T10.5-11.9 Communication of technical information (1)
    - T11.95-12.5 Industrial directories (5)
      - T55-55.3 Industrial safety. Industrial accident prevention (2)
      - T58.5-58.64 Information technology (1)
      - T59.7-59.77 Human engineering in industry. Man-machine systems (2)
    - T173.2-174.5 Technological change (2)
    - T55.4-60.8 Industrial engineering. Management engineering (4)
    - T61-173 Technical education. Technical schools (3)
  - TA Engineering (General). Civil engineering (General) (199)
    - TA1001-1280 Transportation engineering (1)
    - TA1501-1820 Applied optics. Photonics (27)
    - TA166-167 Human engineering (4)
    - TA168 Systems engineering (2)
    - TA170-171 Environmental engineering (1)
    - TA174 Engineering design (3)
    - TA329-348 Engineering mathematics. Engineering analysis (6)
    - TA349-359 Mechanics of engineering. Applied mechanics (12)
    - TA365-367 Acoustics in engineering. Acoustical engineering (2)
    - TA401-492 Materials of engineering and construction. Mechanics of materials (99)
    - TA501-625 Surveying (2)
    - TA630-695 Structural engineering (General) (14)
    - TA703-712 Engineering geology. Rock mechanics. Soil mechanics. (13)
    - TA715-787 Earthwork. Foundations (5)
    - TA800-820 Tunneling. Tunnels (1)
  - TC Hydraulic engineering. Ocean engineering (10)
    - TC1501-1800 Ocean engineering (2)
    - TC160-181 Technical hydraulics (2)
    - TC183-201 General preliminary operations. Dredging. Submarine building (1)
    - TC401-506 River, lake, and water-supply engineering (General) (2)
    - TC530-537 River protective works. Regulation. Flood control (2)
  - TD Environmental technology. Sanitary engineering (90)
    - TD1020-1066 Hazardous substances and their disposal (2)
    - TD159-168 Municipal engineering (1)
    - TD172-193.5 Environmental pollution (6)
    - TD194-195 Environmental effects of industries and plants (3)
    - TD201-500 Water supply for domestic and industrial purposes (19)
      - TD419-428 Water pollution (2)
      - TD429.5-480.7 Water purification. Water treatment and conditioning. Saline water conversion (11)
    - TD511-780 Sewage collection and disposal systems. Sewerage (11)
    - TD783-812.5 Municipal refuse. Solid wastes (14)
    - TD878-894 Special types of environment, Including soil pollution, air pollution, noise pollution (21)
    - TD895-899 Industrial and factory sanitation (8)
      - TD896-899 Industrial and factory wastes (2)
  - TE Highway engineering. Roads and pavements (19)
    - TE175-176.5 Highway design. Interchanges and intersections (1)
    - TE200-205 Materials for roadmaking (2)
    - TE210-228.3 Construction details. Including foundations, maintenance, equipment (7)
    - TE250-278.8 Pavements and paved roads (6)
    - TE279 Streets (1)
    - TE279.5-298 Pedestrian facilities (1)
  - TF Railroad engineering and operation (2)
    - TF200-320 Railway construction (1)
    - TF501-668 Railway operation and management (1)
  - TH Building construction (80)
    - TH1000-1725 Systems of building construction. Including fireproof construction, concrete construction (33)
    - TH2025-3000 Details in building design and construction. Including walls, roofs (1)
    - TH3301-3411 Maintenance and repair (4)
    - TH4021-4977 Buildings: Construction with reference to use. Including public buildings, dwellings (4)
    - TH5011-5701 Construction by phase of the work (Building trades) (2)
    - TH6014-6081 Environmental engineering of buildings. Sanitary engineering of buildings (1)
    - TH7005-7699 Heating and ventilation. Air conditioning (11)
    - TH8001-8581 Decoration and decorative furnishings (1)
      - TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary (1)
    - TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary (1)
  - TJ Mechanical engineering and machinery (136)
    - TJ1040-1119 Machinery exclusive of prime movers (5)
    - TJ1125-1345 Machine shops and machine shop practice (20)
    - TJ163.13-163.25 Power resources (2)
    - TJ163.26-163.5 Energy conservation (4)
    - TJ181-210 Mechanical movements (3)
    - TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General) (26)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (32)
    - TJ227-240 Machine design and drawing (4)
    - TJ241-254.7 Machine construction (General) (4)
    - TJ255-265 Heat engines (6)
    - TJ266-267.5 Turbines. Turbomachines (General) (5)
    - TJ751-805 Miscellaneous motors and engines Including gas, gasoline, diesel engines (8)
    - TJ807-830 Renewable energy sources (11)
    - TJ836-927 Hydraulic machinery (2)
    - TJ950-1030 Pneumatic machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (389)
    - TK1001-1841 Production of electric energy or power. Powerplants. Central stations (36)
    - TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers (56)
    - TK2896-2985 Production of electricity by direct energy conversion (14)
    - TK3001-3521 Distribution or transmission of electric power (39)
    - TK4125-4399 Electric lighting (3)
    - TK4601-4661 Electric heating (1)
    - TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television (108)
    - TK7800-8360 Electronics (124)
      - TK7885-7895 Computer engineering. Computer hardware (6)
      - TK8300-8360 Photoelectronic devices (General) (3)
    - TK9900-9971 Electricity for amateurs. Amateur constructors' manuals (1)
  - TL Motor vehicles. Aeronautics. Astronautics (26)
    - TL1-484 Motor vehicles. Cycles (13)
    - TL500-777 Aeronautics. Aeronautical engineering (7)
  - TN Mining engineering. Metallurgy (10)
    - TN600-799 Metallurgy (9)
    - TN799.5-948 Nonmetallic minerals (1)
  - TP Chemical technology (99)
    - TP1080-1185 Polymers and polymer manufacture (19)
    - TP155-156 Chemical engineering (15)
    - TP200-248 Chemicals: Manufacture, use, etc. (12)
    - TP248.13-248.65 Biotechnology (7)
    - TP250-261 Industrial electrochemistry (3)
    - TP315-360 Fuel (24)
    - TP368-456 Food processing and manufacture (2)
    - TP500-660 Fermentation industries. Beverages. Alcohol (1)
    - TP751-762 Gas industry (2)
    - TP785-869 Clay industries. Ceramics. Glass (2)
    - TP875-888 Cement industries (2)
    - TP890-933 Textile bleaching, dyeing, printing, etc. (1)
  - TS Manufactures (63)
    - TS1080-1268 Paper manufacture and trade (3)
    - TS1300-1865 Textile industries (1)
    - TS155-194 Production management. Operations management (38)
    - TS195-198.8 Packaging (1)
    - TS200-770 Metal manufactures. Metalworking (14)
    - TS800-937 Wood technology. Lumber (3)
  - TX Home economics (5)
    - TX301-339 The house. Including arrangement, care, servants (2)
    - TX341-641 Nutrition. Foods and food supply (2)
    - TX901-946.5 Hospitality industry. Hotels, clubs, restaurants, etc. Food service (1)
- U Military Science (3)
  - UG622 - 1435 Air forces. Air warfare (3)
    - UG1100 - 1435 Equipment and supplies (1)
- V Naval Science (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)