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Library of Congress Subject Areas (16526)
- A General Works (6)
  - AC Collections. Series. Collected works (1)
  - 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 (1249)
  - B Philosophy (General) (93)
  - BC Logic (6)
  - BD Speculative Philosophy (4)
  - BF Psychology (1075)
  - BH Aesthetics (16)
  - BJ Ethics (28)
  - BL Religion (45)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (16)
  - BR Christianity (4)
  - BV Practical Theology (4)
    - BV1460 Religious Education (3)
- 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)
  - CT Biography (9)
- D History General and Old World (236)
  - D History (General) (90)
    - D204 Modern History (15)
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    - D839 Post-war History, 1945 on (3)
    - D880 Developing Countries (1)
    - D901 Europe (General) (6)
  - DA Great Britain (86)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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    - DJK Eastern Europe (3)
  - DK Russia. Soviet Union. Former Soviet Republics (12)
  - DL Northern Europe. Scandinavia (4)
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  - DS Asia (33)
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- E History America (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (4)
  - F001 United States local history (2)
  - F1201 Latin America (General) (2)
- G Geography. Anthropology. Recreation (847)
  - G Geography (General) (58)
  - GA Mathematical geography. Cartography (5)
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  - GC Oceanography (7)
  - GE Environmental Sciences (362)
  - GF Human ecology. Anthropogeography (57)
  - GN Anthropology (26)
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  - GT Manners and customs (8)
  - GV Recreation Leisure (374)
- H Social Sciences (3668)
  - H Social Sciences (General) (792)
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  - HB Economic Theory (510)
  - HC Economic History and Conditions (136)
  - HD Industries. Land use. Labor (1035)
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  - HN Social history and conditions. Social problems. Social reform (142)
  - HQ The family. Marriage. Woman (88)
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  - HV Social pathology. Social and public welfare (184)
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- J Political Science (160)
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  - JV Colonies and colonization. Emigration and immigration. International migration (3)
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- K Law (672)
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- L Education (1249)
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  - LB Theory and practice of education (818)
    - LB1501 Primary Education (102)
    - LB1603 Secondary Education. High schools (36)
    - LB2300 Higher Education (351)
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  - LC Special aspects of education (147)
    - LC5201 Education extension. Adult education. Continuing education (59)
  - LF Individual institutions (Europe) (1)
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  - LT Textbooks (2)
- M Music and Books on Music (134)
  - M Music (113)
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  - MT Musical instruction and study (19)
- N Fine Arts (621)
  - N Visual arts (General) For photography, see TR (226)
  - NA Architecture (318)
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  - NX Arts in general (88)
- P Language and Literature (761)
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  - PN Literature (General) (450)
    - PN0080 Criticism (82)
    - PN0441 Literary History (10)
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    - PN1993 Motion Pictures (66)
    - PN2000 Dramatic representation. The Theater (107)
  - PQ Romance literatures (8)
  - PR English literature (133)
  - PS American literature (12)
  - PT Germanic literature (2)
  - PZ Childrens literature (8)
- Q Science (4406)
  - Q Science (General) (423)
  - QA Mathematics (2616)
    - QA75 Electronic computers. Computer science (1090)
    - QA76 Computer software (665)
  - QB Astronomy (1)
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  - QD Chemistry (818)
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  - QH Natural history (222)
    - QH301 Biology (131)
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  - QK Botany (69)
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  - QM Human anatomy (37)
  - QP Physiology (199)
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    - QR180 Immunology (2)
    - QR355 Virology (28)
- R Medicine (1710)
  - R Medicine (General) (324)
  - RA Public aspects of medicine (396)
    - RA0421 Public health. Hygiene. Preventive Medicine (254)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (18)
  - RC Internal medicine (227)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (58)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (34)
    - RC1200 Sports Medicine (61)
  - RD Surgery (12)
  - RE Ophthalmology (14)
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  - RG Gynecology and obstetrics (46)
  - RJ Pediatrics (47)
    - RJ101 Child Health. Child health services (29)
  - RK Dentistry (55)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (175)
  - RS Pharmacy and materia medica (269)
  - RT Nursing (322)
  - RV Botanic, Thomsonian, and eclectic medicine (18)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (56)
- S Agriculture (1729)
  - S Agriculture (General) (1374)
  - SB Plant culture (513)
  - SD Forestry (47)
  - SF Animal culture (87)
  - SH Aquaculture. Fisheries. Angling (60)
- T Technology (2851)
  - T Technology (General) (603)
    - T201 Patents. Trademarks (3)
  - TA Engineering (General). Civil engineering (General) (1094)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (218)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (170)
  - TJ Mechanical engineering and machinery (151)
  - TK Electrical engineering. Electronics Nuclear engineering (579)
  - TL Motor vehicles. Aeronautics. Astronautics (97)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (154)
  - TR Photography (22)
  - TS Manufactures (138)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (71)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (120)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (20)
  - Z719 Libraries (General) (5)
  - ZA Information resources (27)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (5)