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Library of Congress Subject Areas (13940)
- A General Works (7)
  - AC Collections. Series. Collected works (2)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (978)
  - B Philosophy (General) (85)
  - BC Logic (6)
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  - BV Practical Theology (3)
    - BV1460 Religious Education (2)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
  - CC Archaeology (6)
  - CD Diplomatics. Archives. Seals (5)
    - CD921 Archives (1)
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- D History General and Old World (227)
  - D History (General) (83)
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    - D839 Post-war History, 1945 on (3)
    - D901 Europe (General) (5)
  - DA Great Britain (82)
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  - DE The Mediterranean Region. The Greco-Roman World (4)
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    - DJK Eastern Europe (3)
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- E History America (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (3)
  - F001 United States local history (2)
  - F1201 Latin America (General) (1)
- G Geography. Anthropology. Recreation (686)
  - G Geography (General) (54)
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  - GE Environmental Sciences (295)
  - GF Human ecology. Anthropogeography (36)
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  - GV Recreation Leisure (300)
- H Social Sciences (2982)
  - H Social Sciences (General) (456)
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  - HB Economic Theory (410)
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  - HQ The family. Marriage. Woman (75)
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  - HV Social pathology. Social and public welfare (139)
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- J Political Science (135)
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- K Law (514)
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- L Education (1020)
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    - LB1501 Primary Education (92)
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    - LB2300 Higher Education (265)
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  - LC Special aspects of education (137)
    - LC5201 Education extension. Adult education. Continuing education (51)
  - LF Individual institutions (Europe) (1)
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  - LT Textbooks (2)
- M Music and Books on Music (91)
  - M Music (70)
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  - MT Musical instruction and study (19)
- N Fine Arts (523)
  - N Visual arts (General) For photography, see TR (175)
  - NA Architecture (285)
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  - NX Arts in general (74)
- P Language and Literature (715)
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  - PN Literature (General) (432)
    - PN0080 Criticism (82)
    - PN0441 Literary History (9)
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    - PN2000 Dramatic representation. The Theater (102)
  - PQ Romance literatures (4)
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  - PZ Childrens literature (8)
- Q Science (3914)
  - Q Science (General) (328)
  - QA Mathematics (2332)
    - QA75 Electronic computers. Computer science (851)
    - QA76 Computer software (634)
  - QB Astronomy (1)
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  - QD Chemistry (761)
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  - QH Natural history (192)
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  - QM Human anatomy (34)
  - QP Physiology (195)
  - QR Microbiology (92)
    - QR180 Immunology (1)
    - QR355 Virology (23)
- R Medicine (1498)
  - R Medicine (General) (253)
  - RA Public aspects of medicine (339)
    - RA0421 Public health. Hygiene. Preventive Medicine (202)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (12)
  - RC Internal medicine (204)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (50)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (28)
    - RC1200 Sports Medicine (52)
  - RD Surgery (9)
  - RE Ophthalmology (12)
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  - RG Gynecology and obstetrics (42)
  - RJ Pediatrics (40)
    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (54)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (173)
  - RS Pharmacy and materia medica (261)
  - RT Nursing (285)
  - RV Botanic, Thomsonian, and eclectic medicine (13)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (51)
- S Agriculture (1331)
  - S Agriculture (General) (1018)
  - SB Plant culture (482)
  - SD Forestry (41)
  - SF Animal culture (68)
  - SH Aquaculture. Fisheries. Angling (47)
- T Technology (2645)
  - T Technology (General) (588)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (963)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (209)
  - TE Highway engineering. Roads and pavements (6)
  - TF Railroad engineering and operation (13)
  - TG Bridge engineering (7)
  - TH Building construction (154)
  - TJ Mechanical engineering and machinery (144)
  - TK Electrical engineering. Electronics Nuclear engineering (567)
  - TL Motor vehicles. Aeronautics. Astronautics (93)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (150)
  - TR Photography (19)
  - TS Manufactures (135)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (19)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (70)
  - V Naval Science (General) (20)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (104)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (16)
  - Z719 Libraries (General) (3)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (2)