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Library of Congress Subject Areas (1987)
- A General Works (78)
  - AI Indexes (General) (78)
- B Philosophy. Psychology. Religion (2)
  - B Philosophy (General) (1)
  - BJ Ethics (1)
- D History General and Old World (7)
  - D History (General) (7)
    - D051 Ancient History (1)
    - D204 Modern History (1)
    - D839 Post-war History, 1945 on (5)
- G Geography. Anthropology. Recreation (164)
  - G Geography (General) (146)
  - GC Oceanography (1)
  - GE Environmental Sciences (16)
  - GF Human ecology. Anthropogeography (7)
  - GN Anthropology (2)
  - GT Manners and customs (1)
- H Social Sciences (163)
  - H Social Sciences (General) (90)
  - HB Economic Theory (24)
  - HC Economic History and Conditions (49)
  - HD Industries. Land use. Labor (4)
    - HD28 Management. Industrial Management (4)
  - HG Finance (1)
  - HM Sociology (3)
  - HN Social history and conditions. Social problems. Social reform (1)
- J Political Science (36)
  - J General legislative and executive papers (1)
  - JA Political science (General) (33)
  - JC Political theory (2)
  - JF Political institutions (General) (3)
- K Law (20)
  - K Law (General) (20)
- L Education (393)
  - L Education (General) (392)
  - LB Theory and practice of education (6)
    - LB1501 Primary Education (2)
    - LB1603 Secondary Education. High schools (1)
    - LB2300 Higher Education (1)
  - LC Special aspects of education (1)
- N Fine Arts (10)
  - NA Architecture (9)
  - NX Arts in general (1)
- P Language and Literature (9)
  - PE English (9)
- Q Science (151)
  - Q Science (General) (20)
  - QA Mathematics (12)
    - QA75 Electronic computers. Computer science (1)
    - QA76 Computer software (1)
  - QC Physics (11)
  - QD Chemistry (56)
  - QE Geology (2)
  - QH Natural history (34)
    - QH301 Biology (24)
  - QK Botany (9)
  - QL Zoology (16)
  - QR Microbiology (1)
- R Medicine (216)
  - R Medicine (General) (141)
  - RB Pathology (1)
  - RD Surgery (1)
  - RK Dentistry (57)
  - RS Pharmacy and materia medica (17)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
- S Agriculture (450)
  - S Agriculture (General) (221)
  - SD Forestry (157)
  - SF Animal culture (16)
  - SH Aquaculture. Fisheries. Angling (58)
- T Technology (307)
  - T Technology (General) (14)
  - TA Engineering (General). Civil engineering (General) (11)
  - TD Environmental technology. Sanitary engineering (5)
  - TH Building construction (18)
  - TJ Mechanical engineering and machinery (233)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (14)
  - TR Photography (8)
  - TX Home economics (1)
- V Naval Science (10)
  - V Naval Science (General) (10)