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Library of Congress Subject Areas (6181)
- A General Works (56)
  - AM Museums (General). Collectors and collecting (General) (23)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (1033)
  - B Philosophy (General) (151)
  - BC Logic (5)
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  - BR Christianity (611)
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  - BT Doctrinal Theology (54)
  - BV Practical Theology (321)
    - BV1460 Religious Education (72)
  - BX Christian Denominations (54)
- C Auxiliary Sciences of History (16)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
  - CC Archaeology (4)
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    - CD921 Archives (7)
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- D History General and Old World (9)
  - D History (General) (7)
    - D731 World War II (1)
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- G Geography. Anthropology. Recreation (370)
  - G Geography (General) (18)
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  - GE Environmental Sciences (160)
  - GF Human ecology. Anthropogeography (19)
  - GN Anthropology (46)
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  - GV Recreation Leisure (131)
- H Social Sciences (2130)
  - H Social Sciences (General) (562)
  - HA Statistics (52)
  - HB Economic Theory (911)
  - HC Economic History and Conditions (73)
  - HD Industries. Land use. Labor (665)
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    - HD61 Risk Management (34)
  - HE Transportation and Communications (110)
  - HF Commerce (974)
    - HF5601 Accounting (462)
  - HG Finance (515)
  - HJ Public Finance (195)
  - HM Sociology (360)
  - HN Social history and conditions. Social problems. Social reform (238)
  - HQ The family. Marriage. Woman (70)
  - HS Societies secret benevolent etc (1)
  - 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 (206)
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- M Music and Books on Music (49)
  - M Music (41)
  - ML Literature of music (5)
  - MT Musical instruction and study (4)
- N Fine Arts (593)
  - N Visual arts (General) For photography, see TR (28)
  - NA Architecture (453)
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  - NK Decorative arts Applied arts Decoration and ornament (84)
  - 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)
    - QH426 Genetics (15)
  - QK Botany (86)
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  - QR Microbiology (115)
    - QR180 Immunology (5)
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- R Medicine (828)
  - R Medicine (General) (189)
  - RA Public aspects of medicine (261)
    - RA0421 Public health. Hygiene. Preventive Medicine (210)
    - 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)
    - RC1200 Sports Medicine (4)
  - RD Surgery (20)
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  - RJ Pediatrics (102)
    - RJ101 Child Health. Child health services (14)
  - RK Dentistry (3)
  - RL Dermatology (38)
  - 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 (131)
  - S Agriculture (General) (73)
  - SB Plant culture (30)
  - SD Forestry (4)
  - 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)
  - TF Railroad engineering and operation (1)
  - TH Building construction (60)
  - TJ Mechanical engineering and machinery (7)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - 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)