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Library of Congress Subject Areas (6202)
- A General Works (56)
  - AM Museums (General). Collectors and collecting (General) (23)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (1035)
  - B Philosophy (General) (151)
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  - BT Doctrinal Theology (54)
  - BV Practical Theology (322)
    - BV1460 Religious Education (73)
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- C Auxiliary Sciences of History (16)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
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    - CD921 Archives (7)
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- D History General and Old World (9)
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- G Geography. Anthropology. Recreation (370)
  - G Geography (General) (18)
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  - GN Anthropology (46)
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  - GV Recreation Leisure (131)
- H Social Sciences (2146)
  - H Social Sciences (General) (570)
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  - HB Economic Theory (915)
  - HC Economic History and Conditions (73)
  - HD Industries. Land use. Labor (668)
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  - HE Transportation and Communications (110)
  - HF Commerce (983)
    - HF5601 Accounting (470)
  - HG Finance (519)
  - HJ Public Finance (195)
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  - HN Social history and conditions. Social problems. Social reform (238)
  - HQ The family. Marriage. Woman (70)
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  - HT Communities. Classes. Races (78)
  - HV Social pathology. Social and public welfare (28)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (23)
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- K Law (9)
  - K Law (General) (9)
- L Education (208)
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- M Music and Books on Music (49)
  - M Music (41)
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  - MT Musical instruction and study (4)
- N Fine Arts (595)
  - N Visual arts (General) For photography, see TR (28)
  - NA Architecture (455)
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  - NX Arts in general (77)
- P Language and Literature (48)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (22)
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    - PN2000 Dramatic representation. The Theater (1)
  - PS American literature (1)
- Q Science (2281)
  - Q Science (General) (7)
  - QA Mathematics (1897)
    - QA75 Electronic computers. Computer science (1763)
    - QA76 Computer software (1165)
  - QB Astronomy (3)
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  - QD Chemistry (26)
  - QE Geology (5)
  - QH Natural history (221)
    - QH301 Biology (208)
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  - QK Botany (86)
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  - QR Microbiology (115)
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- R Medicine (828)
  - R Medicine (General) (189)
  - RA Public aspects of medicine (261)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (132)
  - RC Internal medicine (262)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (11)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (128)
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  - RM Therapeutics. Pharmacology (64)
  - RS Pharmacy and materia medica (51)
  - RT Nursing (20)
  - RV Botanic, Thomsonian, and eclectic medicine (50)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (104)
- S Agriculture (132)
  - S Agriculture (General) (74)
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  - SF Animal culture (25)
  - SH Aquaculture. Fisheries. Angling (8)
- T Technology (816)
  - T Technology (General) (597)
  - TA Engineering (General). Civil engineering (General) (10)
  - TD Environmental technology. Sanitary engineering (59)
  - TE Highway engineering. Roads and pavements (6)
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  - TH Building construction (60)
  - TJ Mechanical engineering and machinery (7)
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  - TL Motor vehicles. Aeronautics. Astronautics (7)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (13)
  - TR Photography (3)
  - TS Manufactures (25)
  - TT Handicrafts Arts and crafts (113)
  - TX Home economics (14)
- Z Bibliography. Library Science. Information Resources (522)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (3)
  - Z719 Libraries (General) (13)
  - ZA Information resources (508)
    - ZA4050 Electronic information resources (184)
    - ZA4450 Databases (58)