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Library of Congress Subject Areas (19598)
- A General Works (243)
  - AC Collections. Series. Collected works (57)
  - AI Indexes (General) (24)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (142)
  - AZ History of Scholarship The Humanities (18)
- B Philosophy. Psychology. Religion (417)
  - B Philosophy (General) (21)
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  - BL Religion (62)
  - BP Islam. Bahaism. Theosophy, etc (281)
  - BQ Buddhism (6)
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  - BV Practical Theology (1)
- C Auxiliary Sciences of History (2)
  - CT Biography (2)
- D History General and Old World (41)
  - D History (General) (13)
    - D111 Medieval History (1)
    - D880 Developing Countries (3)
  - DS Asia (28)
- G Geography. Anthropology. Recreation (445)
  - G Geography (General) (11)
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  - GN Anthropology (1)
  - GT Manners and customs (21)
  - GV Recreation Leisure (353)
- H Social Sciences (2426)
  - H Social Sciences (General) (1103)
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  - HB Economic Theory (36)
  - HC Economic History and Conditions (13)
  - HD Industries. Land use. Labor (672)
    - HD28 Management. Industrial Management (371)
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  - HE Transportation and Communications (62)
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    - HF5601 Accounting (4)
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  - HN Social history and conditions. Social problems. Social reform (30)
  - HQ The family. Marriage. Woman (44)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (284)
  - HV Social pathology. Social and public welfare (324)
  - HX Socialism. Communism. Anarchism (7)
- J Political Science (134)
  - JA Political science (General) (99)
  - JF Political institutions (General) (7)
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  - JS Local government Municipal government (3)
  - JZ International relations (19)
- K Law (13)
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  - KF United States Federal Law (2)
- L Education (2372)
  - L Education (General) (1976)
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  - LB Theory and practice of education (223)
    - LB1501 Primary Education (12)
    - LB1603 Secondary Education. High schools (12)
    - LB2300 Higher Education (131)
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  - LC Special aspects of education (30)
    - LC5201 Education extension. Adult education. Continuing education (20)
  - LF Individual institutions (Europe) (1)
  - LG Individual institutions (Asia. Africa) (371)
  - LT Textbooks (3)
- M Music and Books on Music (10)
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- N Fine Arts (24)
  - N Visual arts (General) For photography, see TR (6)
  - NA Architecture (2)
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  - NX Arts in general (9)
- Not Available (66)
- P Language and Literature (266)
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  - PR English literature (9)
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- Q Science (3515)
  - Q Science (General) (1234)
  - QA Mathematics (1501)
    - QA75 Electronic computers. Computer science (438)
    - QA76 Computer software (684)
  - QB Astronomy (14)
  - QC Physics (223)
  - QD Chemistry (555)
  - QE Geology (8)
  - QH Natural history (10)
    - QH301 Biology (2)
    - QH426 Genetics (1)
  - QK Botany (48)
  - QL Zoology (9)
  - QM Human anatomy (8)
  - QP Physiology (51)
  - QR Microbiology (74)
    - QR180 Immunology (3)
- R Medicine (156)
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  - RA Public aspects of medicine (24)
    - RA0421 Public health. Hygiene. Preventive Medicine (16)
  - RB Pathology (1)
  - RC Internal medicine (11)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (3)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1)
  - RD Surgery (15)
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    - RJ101 Child Health. Child health services (1)
  - RL Dermatology (1)
  - RM Therapeutics. Pharmacology (26)
  - RS Pharmacy and materia medica (14)
  - RV Botanic, Thomsonian, and eclectic medicine (7)
  - RZ Other systems of medicine (17)
- S Agriculture (101)
  - S Agriculture (General) (58)
  - SB Plant culture (22)
  - SD Forestry (5)
  - SF Animal culture (15)
  - SH Aquaculture. Fisheries. Angling (9)
- T Technology (11985)
  - T Technology (General) (1307)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (2063)
  - TC Hydraulic engineering. Ocean engineering (78)
  - TD Environmental technology. Sanitary engineering (443)
  - TE Highway engineering. Roads and pavements (78)
  - TF Railroad engineering and operation (47)
  - TG Bridge engineering (11)
  - TH Building construction (190)
  - TJ Mechanical engineering and machinery (2516)
  - TK Electrical engineering. Electronics Nuclear engineering (1570)
  - TL Motor vehicles. Aeronautics. Astronautics (343)
  - TN Mining engineering. Metallurgy (60)
  - TP Chemical technology (3055)
  - TR Photography (9)
  - TS Manufactures (955)
  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (7)
- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (6)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (4)
- Z Bibliography. Library Science. Information Resources (108)
  - Z004 Books. Writing. Paleography (49)
  - Z665 Library Science. Information Science (17)
  - Z719 Libraries (General) (29)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (5)