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Library of Congress Subject Areas (2382)
- A General Works (1)
  - AS Academies and learned societies (General) (1)
- D History General and Old World (5)
  - D History (General) (2)
  - DC France (2)
  - DS Asia (1)
- E History America (1)
  - E11 America (General) (1)
- F History United States, Canada, Latin America (1)
  - F001 United States local history (1)
- G Geography. Anthropology. Recreation (13)
  - G Geography (General) (3)
  - GB Physical geography (2)
  - GE Environmental Sciences (1)
  - GN Anthropology (7)
  - GV Recreation Leisure (1)
- H Social Sciences (362)
  - H Social Sciences (General) (154)
  - HB Economic Theory (86)
  - HC Economic History and Conditions (15)
  - HD Industries. Land use. Labor (34)
    - HD28 Management. Industrial Management (20)
    - HD61 Risk Management (7)
  - HE Transportation and Communications (13)
  - HF Commerce (26)
    - HF5601 Accounting (15)
  - HG Finance (25)
  - HJ Public Finance (49)
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  - HN Social history and conditions. Social problems. Social reform (37)
  - HQ The family. Marriage. Woman (6)
  - HS Societies secret benevolent etc (2)
  - HT Communities. Classes. Races (22)
  - HV Social pathology. Social and public welfare (4)
  - HX Socialism. Communism. Anarchism (6)
- J Political Science (67)
  - J General legislative and executive papers (8)
  - JA Political science (General) (37)
  - JC Political theory (9)
  - JF Political institutions (General) (5)
  - JK Political institutions (United States) (1)
  - JS Local government Municipal government (28)
  - JZ International relations (10)
- K Law (161)
  - K Law (General) (161)
  - KZ Law of Nations (1)
- L Education (9)
  - L Education (General) (8)
  - LA History of education (1)
  - LB Theory and practice of education (3)
    - LB1603 Secondary Education. High schools (1)
  - LC Special aspects of education (2)
- N Fine Arts (17)
  - N Visual arts (General) For photography, see TR (1)
  - NA Architecture (13)
  - NE Print media (2)
  - NK Decorative arts Applied arts Decoration and ornament (1)
  - NX Arts in general (1)
- P Language and Literature (107)
  - P Philology. Linguistics (13)
  - PA Classical philology (2)
  - PC Romance languages (2)
  - PE English (12)
  - PI Oriental languages and literatures (7)
  - PK Indo-Iranian (4)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (7)
  - PN Literature (General) (19)
    - PN0441 Literary History (2)
    - PN2000 Dramatic representation. The Theater (1)
  - PQ Romance literatures (8)
  - PR English literature (35)
  - PS American literature (1)
- Q Science (338)
  - Q Science (General) (233)
  - QA Mathematics (43)
    - QA75 Electronic computers. Computer science (5)
    - QA76 Computer software (2)
  - QC Physics (13)
  - QD Chemistry (20)
  - QH Natural history (3)
    - QH301 Biology (1)
  - QK Botany (5)
  - QL Zoology (12)
  - QP Physiology (20)
  - QR Microbiology (6)
    - QR355 Virology (1)
- R Medicine (853)
  - R Medicine (General) (525)
  - RA Public aspects of medicine (159)
    - RA0421 Public health. Hygiene. Preventive Medicine (106)
  - RB Pathology (2)
  - RC Internal medicine (61)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (10)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (5)
    - RC1200 Sports Medicine (1)
  - RD Surgery (10)
  - RE Ophthalmology (3)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (44)
  - RJ Pediatrics (16)
    - RJ101 Child Health. Child health services (10)
  - RK Dentistry (108)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (15)
  - RS Pharmacy and materia medica (51)
  - RT Nursing (98)
  - RV Botanic, Thomsonian, and eclectic medicine (16)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (28)
- S Agriculture (239)
  - S Agriculture (General) (70)
  - SB Plant culture (37)
  - SD Forestry (51)
  - SF Animal culture (80)
  - SH Aquaculture. Fisheries. Angling (25)
- T Technology (299)
  - T Technology (General) (91)
  - TA Engineering (General). Civil engineering (General) (68)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (29)
  - TE Highway engineering. Roads and pavements (6)
  - TF Railroad engineering and operation (1)
  - TH Building construction (13)
  - TJ Mechanical engineering and machinery (49)
  - TK Electrical engineering. Electronics Nuclear engineering (26)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (8)
  - TS Manufactures (1)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (2)
- V Naval Science (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (1)
  - ZA Information resources (1)