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Library of Congress Subject Areas (5120)
- A General Works (52)
  - AM Museums (General). Collectors and collecting (General) (20)
  - AS Academies and learned societies (General) (32)
- B Philosophy. Psychology. Religion (877)
  - B Philosophy (General) (129)
  - BC Logic (5)
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  - BR Christianity (545)
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  - BT Doctrinal Theology (51)
  - BV Practical Theology (274)
    - BV1460 Religious Education (63)
  - BX Christian Denominations (49)
- C Auxiliary Sciences of History (13)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
  - CC Archaeology (2)
  - CD Diplomatics. Archives. Seals (7)
    - CD921 Archives (7)
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- D History General and Old World (8)
  - D History (General) (6)
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- G Geography. Anthropology. Recreation (321)
  - G Geography (General) (12)
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  - GE Environmental Sciences (139)
  - GF Human ecology. Anthropogeography (17)
  - GN Anthropology (43)
  - GR Folklore (10)
  - GT Manners and customs (37)
  - GV Recreation Leisure (110)
- H Social Sciences (1683)
  - H Social Sciences (General) (354)
  - HA Statistics (42)
  - HB Economic Theory (744)
  - HC Economic History and Conditions (72)
  - HD Industries. Land use. Labor (488)
    - HD28 Management. Industrial Management (274)
    - HD61 Risk Management (24)
  - HE Transportation and Communications (84)
  - HF Commerce (745)
    - HF5601 Accounting (385)
  - HG Finance (393)
  - HJ Public Finance (180)
  - HM Sociology (191)
  - HN Social history and conditions. Social problems. Social reform (225)
  - HQ The family. Marriage. Woman (60)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (71)
  - HV Social pathology. Social and public welfare (25)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (22)
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  - JS Local government Municipal government (1)
- K Law (9)
  - K Law (General) (9)
- L Education (154)
  - L Education (General) (127)
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    - LB1501 Primary Education (5)
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    - LB2361 Curriculum (4)
  - LC Special aspects of education (5)
    - LC5201 Education extension. Adult education. Continuing education (4)
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- M Music and Books on Music (37)
  - M Music (32)
  - ML Literature of music (4)
  - MT Musical instruction and study (2)
- N Fine Arts (474)
  - N Visual arts (General) For photography, see TR (25)
  - NA Architecture (357)
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  - NK Decorative arts Applied arts Decoration and ornament (71)
  - NX Arts in general (69)
- P Language and Literature (41)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (19)
  - PN Literature (General) (1)
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- Q Science (2008)
  - Q Science (General) (3)
  - QA Mathematics (1686)
    - QA75 Electronic computers. Computer science (1575)
    - QA76 Computer software (1038)
  - QB Astronomy (3)
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  - QD Chemistry (20)
  - QE Geology (5)
  - QH Natural history (176)
    - QH301 Biology (163)
    - QH426 Genetics (15)
  - QK Botany (74)
  - QL Zoology (82)
  - QM Human anatomy (6)
  - QP Physiology (5)
  - QR Microbiology (90)
    - QR180 Immunology (2)
    - QR355 Virology (1)
- R Medicine (710)
  - R Medicine (General) (103)
  - RA Public aspects of medicine (244)
    - RA0421 Public health. Hygiene. Preventive Medicine (194)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (128)
  - RC Internal medicine (235)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (9)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (120)
    - RC1200 Sports Medicine (4)
  - RD Surgery (17)
  - RE Ophthalmology (11)
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  - RG Gynecology and obstetrics (72)
  - RJ Pediatrics (97)
    - RJ101 Child Health. Child health services (12)
  - RK Dentistry (2)
  - RL Dermatology (34)
  - RM Therapeutics. Pharmacology (54)
  - RS Pharmacy and materia medica (49)
  - RT Nursing (18)
  - RV Botanic, Thomsonian, and eclectic medicine (44)
  - RZ Other systems of medicine (83)
- S Agriculture (101)
  - S Agriculture (General) (65)
  - SB Plant culture (20)
  - SD Forestry (4)
  - SF Animal culture (17)
  - SH Aquaculture. Fisheries. Angling (4)
- T Technology (655)
  - T Technology (General) (482)
  - TA Engineering (General). Civil engineering (General) (3)
  - 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 (6)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (13)
  - TR Photography (1)
  - TS Manufactures (19)
  - TT Handicrafts Arts and crafts (77)
  - TX Home economics (6)
- Z Bibliography. Library Science. Information Resources (406)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (2)
  - Z719 Libraries (General) (10)
  - ZA Information resources (394)
    - ZA4050 Electronic information resources (152)
    - ZA4450 Databases (33)