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Library of Congress Subject Areas (1771)
- 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)
- 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 (320)
  - H Social Sciences (General) (141)
  - HB Economic Theory (76)
  - HC Economic History and Conditions (14)
  - HD Industries. Land use. Labor (31)
    - HD28 Management. Industrial Management (20)
    - HD61 Risk Management (5)
  - HE Transportation and Communications (13)
  - HF Commerce (23)
    - HF5601 Accounting (12)
  - HG Finance (21)
  - HJ Public Finance (45)
  - HM Sociology (9)
  - HN Social history and conditions. Social problems. Social reform (36)
  - HQ The family. Marriage. Woman (6)
  - HS Societies secret benevolent etc (2)
  - HT Communities. Classes. Races (21)
  - HV Social pathology. Social and public welfare (3)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (65)
  - J General legislative and executive papers (8)
  - JA Political science (General) (36)
  - JC Political theory (9)
  - JF Political institutions (General) (5)
  - JK Political institutions (United States) (1)
  - JS Local government Municipal government (26)
  - JZ International relations (10)
- K Law (121)
  - K Law (General) (121)
  - 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 (10)
  - N Visual arts (General) For photography, see TR (1)
  - NA Architecture (6)
  - NE Print media (2)
  - NK Decorative arts Applied arts Decoration and ornament (1)
  - NX Arts in general (1)
- P Language and Literature (88)
  - P Philology. Linguistics (13)
  - PA Classical philology (1)
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  - PE English (11)
  - PI Oriental languages and literatures (6)
  - PK Indo-Iranian (3)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (6)
  - PN Literature (General) (15)
    - PN0441 Literary History (2)
    - PN2000 Dramatic representation. The Theater (1)
  - PQ Romance literatures (4)
  - PR English literature (30)
  - PS American literature (1)
- Q Science (244)
  - Q Science (General) (155)
  - QA Mathematics (38)
    - QA75 Electronic computers. Computer science (5)
    - QA76 Computer software (1)
  - QC Physics (11)
  - QD Chemistry (18)
  - QH Natural history (3)
    - QH301 Biology (1)
  - QK Botany (5)
  - QL Zoology (12)
  - QP Physiology (13)
  - QR Microbiology (6)
    - QR355 Virology (1)
- R Medicine (573)
  - R Medicine (General) (370)
  - RA Public aspects of medicine (123)
    - RA0421 Public health. Hygiene. Preventive Medicine (72)
  - RB Pathology (2)
  - RC Internal medicine (48)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (9)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (4)
    - RC1200 Sports Medicine (1)
  - RD Surgery (5)
  - RE Ophthalmology (1)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (36)
  - RJ Pediatrics (10)
    - RJ101 Child Health. Child health services (9)
  - RK Dentistry (34)
  - RL Dermatology (5)
  - RM Therapeutics. Pharmacology (13)
  - RS Pharmacy and materia medica (27)
  - RT Nursing (46)
  - RV Botanic, Thomsonian, and eclectic medicine (3)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (25)
- S Agriculture (159)
  - S Agriculture (General) (58)
  - SB Plant culture (37)
  - SD Forestry (33)
  - SF Animal culture (45)
  - SH Aquaculture. Fisheries. Angling (10)
- T Technology (253)
  - T Technology (General) (77)
  - TA Engineering (General). Civil engineering (General) (52)
  - TC Hydraulic engineering. Ocean engineering (10)
  - TD Environmental technology. Sanitary engineering (25)
  - TE Highway engineering. Roads and pavements (5)
  - TF Railroad engineering and operation (1)
  - TH Building construction (13)
  - TJ Mechanical engineering and machinery (35)
  - TK Electrical engineering. Electronics Nuclear engineering (25)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (7)
  - TS Manufactures (1)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (1)
- Z Bibliography. Library Science. Information Resources (1)
  - ZA Information resources (1)