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Library of Congress Subject Areas (2402)
- B Philosophy. Psychology. Religion (4)
  - BF Psychology (3)
  - BP Islam. Bahaism. Theosophy, etc (1)
- G Geography. Anthropology. Recreation (96)
  - G Geography (General) (16)
  - GC Oceanography (1)
  - GE Environmental Sciences (6)
  - GN Anthropology (1)
  - GT Manners and customs (9)
  - GV Recreation Leisure (63)
- H Social Sciences (1877)
  - H Social Sciences (General) (117)
  - HA Statistics (6)
  - HB Economic Theory (139)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (448)
    - HD28 Management. Industrial Management (51)
    - HD61 Risk Management (1)
  - HE Transportation and Communications (25)
  - HF Commerce (1035)
    - HF5601 Accounting (23)
  - HG Finance (300)
  - HJ Public Finance (10)
  - HM Sociology (8)
  - HN Social history and conditions. Social problems. Social reform (4)
  - HQ The family. Marriage. Woman (23)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (7)
  - HV Social pathology. Social and public welfare (4)
- J Political Science (2)
  - JA Political science (General) (1)
  - JQ Political institutions Asia (1)
- K Law (3)
  - K Law (General) (3)
- L Education (13)
  - L Education (General) (8)
  - LB Theory and practice of education (3)
    - LB1603 Secondary Education. High schools (1)
  - LC Special aspects of education (3)
- M Music and Books on Music (19)
  - M Music (10)
  - ML Literature of music (6)
  - MT Musical instruction and study (3)
- N Fine Arts (24)
  - N Visual arts (General) For photography, see TR (1)
  - NA Architecture (1)
  - NC Drawing Design Illustration (2)
  - NE Print media (1)
  - NK Decorative arts Applied arts Decoration and ornament (11)
  - NX Arts in general (8)
- P Language and Literature (2)
  - PE English (1)
  - PN Literature (General) (1)
- Q Science (57)
  - Q Science (General) (11)
  - QA Mathematics (36)
    - QA75 Electronic computers. Computer science (9)
    - QA76 Computer software (7)
  - QC Physics (2)
  - QD Chemistry (6)
  - QH Natural history (3)
    - QH301 Biology (3)
  - QK Botany (2)
  - QP Physiology (3)
  - QR Microbiology (1)
- R Medicine (42)
  - R Medicine (General) (9)
  - RA Public aspects of medicine (20)
    - RA0421 Public health. Hygiene. Preventive Medicine (9)
  - RC Internal medicine (2)
  - RJ Pediatrics (2)
    - RJ101 Child Health. Child health services (2)
  - RK Dentistry (2)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (3)
  - RS Pharmacy and materia medica (3)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (1)
- S Agriculture (56)
  - S Agriculture (General) (20)
  - SB Plant culture (15)
  - SD Forestry (2)
  - SF Animal culture (9)
  - SH Aquaculture. Fisheries. Angling (10)
- T Technology (448)
  - T Technology (General) (143)
  - TA Engineering (General). Civil engineering (General) (3)
  - TD Environmental technology. Sanitary engineering (5)
  - TG Bridge engineering (1)
  - TH Building construction (7)
  - TJ Mechanical engineering and machinery (9)
  - TK Electrical engineering. Electronics Nuclear engineering (22)
  - TL Motor vehicles. Aeronautics. Astronautics (18)
  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (72)
  - TR Photography (2)
  - TS Manufactures (43)
  - TT Handicrafts Arts and crafts (26)
  - TX Home economics (132)
- Z Bibliography. Library Science. Information Resources (8)
  - Z004 Books. Writing. Paleography (4)
  - ZA Information resources (4)
    - ZA4050 Electronic information resources (2)
    - ZA4450 Databases (1)