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Library of Congress Subject Areas (5647)
- A General Works (55)
  - AM Museums (General). Collectors and collecting (General) (22)
  - AS Academies and learned societies (General) (33)
- B Philosophy. Psychology. Religion (901)
  - B Philosophy (General) (132)
  - BC Logic (5)
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  - BT Doctrinal Theology (51)
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    - BV1460 Religious Education (64)
  - BX Christian Denominations (49)
- C Auxiliary Sciences of History (15)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
  - CC Archaeology (4)
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    - CD921 Archives (7)
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- D History General and Old World (8)
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- G Geography. Anthropology. Recreation (341)
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  - GF Human ecology. Anthropogeography (17)
  - GN Anthropology (45)
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  - GT Manners and customs (37)
  - GV Recreation Leisure (119)
- H Social Sciences (1943)
  - H Social Sciences (General) (477)
  - HA Statistics (49)
  - HB Economic Theory (879)
  - HC Economic History and Conditions (73)
  - HD Industries. Land use. Labor (594)
    - HD28 Management. Industrial Management (330)
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  - HE Transportation and Communications (107)
  - HF Commerce (909)
    - HF5601 Accounting (436)
  - HG Finance (481)
  - HJ Public Finance (189)
  - HM Sociology (313)
  - HN Social history and conditions. Social problems. Social reform (226)
  - HQ The family. Marriage. Woman (60)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (74)
  - HV Social pathology. Social and public welfare (28)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (22)
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- K Law (9)
  - K Law (General) (9)
- L Education (181)
  - L Education (General) (149)
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    - LB1501 Primary Education (5)
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- M Music and Books on Music (40)
  - M Music (35)
  - ML Literature of music (4)
  - MT Musical instruction and study (2)
- N Fine Arts (542)
  - N Visual arts (General) For photography, see TR (27)
  - NA Architecture (412)
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  - NK Decorative arts Applied arts Decoration and ornament (80)
  - NX Arts in general (72)
- P Language and Literature (45)
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  - PN Literature (General) (1)
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- Q Science (2175)
  - Q Science (General) (3)
  - QA Mathematics (1837)
    - QA75 Electronic computers. Computer science (1725)
    - QA76 Computer software (1117)
  - QB Astronomy (3)
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  - QD Chemistry (25)
  - QE Geology (5)
  - QH Natural history (186)
    - QH301 Biology (173)
    - QH426 Genetics (15)
  - QK Botany (75)
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  - QM Human anatomy (6)
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  - QR Microbiology (91)
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- R Medicine (730)
  - R Medicine (General) (111)
  - RA Public aspects of medicine (246)
    - RA0421 Public health. Hygiene. Preventive Medicine (196)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (130)
  - RC Internal medicine (238)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (9)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (121)
    - RC1200 Sports Medicine (4)
  - RD Surgery (19)
  - RE Ophthalmology (11)
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  - RG Gynecology and obstetrics (73)
  - RJ Pediatrics (99)
    - RJ101 Child Health. Child health services (12)
  - RK Dentistry (3)
  - RL Dermatology (36)
  - RM Therapeutics. Pharmacology (54)
  - RS Pharmacy and materia medica (50)
  - RT Nursing (18)
  - RV Botanic, Thomsonian, and eclectic medicine (47)
  - RZ Other systems of medicine (85)
- S Agriculture (114)
  - S Agriculture (General) (71)
  - SB Plant culture (21)
  - SD Forestry (4)
  - SF Animal culture (21)
  - SH Aquaculture. Fisheries. Angling (6)
- T Technology (759)
  - T Technology (General) (560)
  - TA Engineering (General). Civil engineering (General) (8)
  - TD Environmental technology. Sanitary engineering (48)
  - TE Highway engineering. Roads and pavements (6)
  - TF Railroad engineering and operation (1)
  - TH Building construction (56)
  - TJ Mechanical engineering and machinery (7)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (13)
  - TR Photography (3)
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  - TT Handicrafts Arts and crafts (109)
  - TX Home economics (13)
- Z Bibliography. Library Science. Information Resources (511)
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  - Z665 Library Science. Information Science (2)
  - Z719 Libraries (General) (12)
  - ZA Information resources (498)
    - ZA4050 Electronic information resources (181)
    - ZA4450 Databases (53)