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Library of Congress Subject Areas (6510)
- A General Works (25)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (3)
  - AS Academies and learned societies (General) (20)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (15)
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  - BP Islam. Bahaism. Theosophy, etc (3)
- C Auxiliary Sciences of History (1)
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- D History General and Old World (1)
  - DS Asia (1)
- E History America (1)
  - E11 America (General) (1)
- G Geography. Anthropology. Recreation (10)
  - G Geography (General) (6)
  - GE Environmental Sciences (2)
  - GF Human ecology. Anthropogeography (1)
  - GV Recreation Leisure (1)
- H Social Sciences (2148)
  - H Social Sciences (General) (447)
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  - HB Economic Theory (333)
  - HC Economic History and Conditions (243)
  - HD Industries. Land use. Labor (269)
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    - HF5601 Accounting (178)
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  - HN Social history and conditions. Social problems. Social reform (386)
  - HQ The family. Marriage. Woman (6)
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  - HT Communities. Classes. Races (87)
  - HV Social pathology. Social and public welfare (9)
  - HX Socialism. Communism. Anarchism (7)
- J Political Science (383)
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  - JQ Political institutions Asia (132)
  - JS Local government Municipal government (58)
  - JV Colonies and colonization. Emigration and immigration. International migration (25)
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- K Law (884)
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- L Education (71)
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    - LB1603 Secondary Education. High schools (1)
    - LB2300 Higher Education (3)
    - LB2361 Curriculum (1)
  - LT Textbooks (2)
- N Fine Arts (9)
  - N Visual arts (General) For photography, see TR (4)
  - NA Architecture (1)
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  - NX Arts in general (2)
- P Language and Literature (17)
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- Q Science (706)
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  - QR Microbiology (8)
    - QR180 Immunology (2)
    - QR355 Virology (1)
- R Medicine (1821)
  - R Medicine (General) (1079)
  - RA Public aspects of medicine (409)
    - RA0421 Public health. Hygiene. Preventive Medicine (269)
  - RB Pathology (47)
  - RC Internal medicine (41)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (7)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (7)
    - RC1200 Sports Medicine (20)
  - RD Surgery (4)
  - RE Ophthalmology (8)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (39)
  - RJ Pediatrics (64)
    - RJ101 Child Health. Child health services (48)
  - RK Dentistry (3)
  - RL Dermatology (14)
  - RM Therapeutics. Pharmacology (37)
  - RS Pharmacy and materia medica (16)
  - RT Nursing (319)
  - RV Botanic, Thomsonian, and eclectic medicine (23)
  - RX Homeopathy (7)
  - RZ Other systems of medicine (102)
- S Agriculture (17)
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  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (601)
  - T Technology (General) (72)
  - TA Engineering (General). Civil engineering (General) (370)
  - TC Hydraulic engineering. Ocean engineering (3)
  - TD Environmental technology. Sanitary engineering (11)
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  - TH Building construction (10)
  - TJ Mechanical engineering and machinery (102)
  - TK Electrical engineering. Electronics Nuclear engineering (5)
  - TL Motor vehicles. Aeronautics. Astronautics (31)
  - TN Mining engineering. Metallurgy (8)
  - TP Chemical technology (1)
  - TR Photography (3)
  - TS Manufactures (88)
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  - TX Home economics (4)
- U Military Science (23)
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- V Naval Science (33)
  - V Naval Science (General) (19)
  - VM Naval architecture. Shipbuilding. Marine engineering (30)
- Z Bibliography. Library Science. Information Resources (62)
  - Z004 Books. Writing. Paleography (4)
  - Z665 Library Science. Information Science (15)
  - Z719 Libraries (General) (37)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (9)