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Library of Congress Subject Areas (1614)
- A General Works (8)
  - AC Collections. Series. Collected works (5)
  - AS Academies and learned societies (General) (3)
- D History General and Old World (1)
  - D History (General) (1)
- G Geography. Anthropology. Recreation (8)
  - G Geography (General) (2)
  - GE Environmental Sciences (7)
- H Social Sciences (87)
  - H Social Sciences (General) (20)
  - HB Economic Theory (35)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (8)
    - HD28 Management. Industrial Management (5)
  - HE Transportation and Communications (2)
  - HF Commerce (32)
  - HG Finance (5)
  - HJ Public Finance (3)
  - HM Sociology (1)
  - HN Social history and conditions. Social problems. Social reform (3)
  - HT Communities. Classes. Races (2)
- K Law (4)
  - K Law (General) (4)
- L Education (4)
  - L Education (General) (4)
- N Fine Arts (2)
  - NC Drawing Design Illustration (2)
- P Language and Literature (3)
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- Q Science (249)
  - Q Science (General) (140)
  - QA Mathematics (1)
  - QD Chemistry (16)
  - QK Botany (44)
  - QL Zoology (43)
  - QP Physiology (1)
  - QR Microbiology (40)
- R Medicine (55)
  - R Medicine (General) (37)
  - RA Public aspects of medicine (1)
  - RV Botanic, Thomsonian, and eclectic medicine (16)
  - RX Homeopathy (1)
- S Agriculture (1133)
  - S Agriculture (General) (914)
  - SB Plant culture (28)
  - SD Forestry (2)
  - SF Animal culture (203)
  - SH Aquaculture. Fisheries. Angling (6)
- T Technology (305)
  - T Technology (General) (172)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (20)
  - TD Environmental technology. Sanitary engineering (1)
  - TJ Mechanical engineering and machinery (16)
  - TP Chemical technology (6)
  - TS Manufactures (3)
  - TX Home economics (89)

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