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Library of Congress Subject Areas (670)
- B Philosophy. Psychology. Religion (1)
  - BF Psychology (1)
- G Geography. Anthropology. Recreation (33)
  - G Geography (General) (3)
  - GE Environmental Sciences (2)
  - GT Manners and customs (6)
  - GV Recreation Leisure (22)
- H Social Sciences (559)
  - H Social Sciences (General) (26)
  - HA Statistics (6)
  - HB Economic Theory (107)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (135)
    - HD28 Management. Industrial Management (5)
    - HD61 Risk Management (1)
  - HE Transportation and Communications (3)
  - HF Commerce (269)
    - HF5601 Accounting (4)
  - HG Finance (146)
  - HJ Public Finance (5)
  - HM Sociology (4)
  - HN Social history and conditions. Social problems. Social reform (3)
  - HQ The family. Marriage. Woman (3)
- J Political Science (1)
  - JA Political science (General) (1)
- L Education (4)
  - L Education (General) (3)
  - LB Theory and practice of education (1)
- M Music and Books on Music (4)
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  - ML Literature of music (2)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- Q Science (14)
  - Q Science (General) (4)
  - QA Mathematics (8)
    - QA76 Computer software (3)
  - QH Natural history (2)
    - QH301 Biology (2)
  - QP Physiology (3)
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- R Medicine (4)
  - R Medicine (General) (1)
  - RA Public aspects of medicine (2)
  - RM Therapeutics. Pharmacology (2)
- S Agriculture (24)
  - S Agriculture (General) (14)
  - SB Plant culture (6)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (3)
- T Technology (101)
  - T Technology (General) (41)
  - TJ Mechanical engineering and machinery (3)
  - TK Electrical engineering. Electronics Nuclear engineering (4)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (31)
  - TR Photography (1)
  - TS Manufactures (1)
  - TX Home economics (40)