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Library of Congress Subject Areas (24934)
- A General Works (1947)
  - AC Collections. Series. Collected works (200)
  - AI Indexes (General) (1745)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (1)
  - BP Islam. Bahaism. Theosophy, etc (1)
- C Auxiliary Sciences of History (8)
  - CB History of civilization (2)
  - CD Diplomatics. Archives. Seals (6)
- D History General and Old World (1)
  - DA Great Britain (1)
- F History United States, Canada, Latin America (5)
  - F001 United States local history (5)
- G Geography. Anthropology. Recreation (21)
  - G Geography (General) (17)
  - GB Physical geography (1)
  - GC Oceanography (1)
  - GV Recreation Leisure (2)
- H Social Sciences (1262)
  - H Social Sciences (General) (403)
  - HA Statistics (21)
  - HB Economic Theory (339)
  - HC Economic History and Conditions (80)
  - HD Industries. Land use. Labor (16)
    - HD28 Management. Industrial Management (9)
    - HD61 Risk Management (1)
  - HE Transportation and Communications (144)
  - HF Commerce (91)
    - HF5601 Accounting (81)
  - HG Finance (37)
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  - HM Sociology (213)
  - HN Social history and conditions. Social problems. Social reform (4)
  - HQ The family. Marriage. Woman (2)
  - HT Communities. Classes. Races (5)
  - HV Social pathology. Social and public welfare (1)
- J Political Science (215)
  - J General legislative and executive papers (60)
  - JA Political science (General) (37)
  - JC Political theory (8)
  - JF Political institutions (General) (1)
  - JS Local government Municipal government (1)
  - JZ International relations (108)
- K Law (4509)
  - K Law (General) (4126)
  - KD England and Wales (3)
  - KF United States Federal Law (1)
  - KZ Law of Nations (382)
- L Education (6503)
  - L Education (General) (6418)
  - LA History of education (17)
  - LB Theory and practice of education (98)
    - LB1501 Primary Education (13)
    - LB1603 Secondary Education. High schools (8)
    - LB2300 Higher Education (22)
  - LC Special aspects of education (6)
  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (3)
- M Music and Books on Music (2)
  - M Music (1)
  - ML Literature of music (1)
- P Language and Literature (576)
  - P Philology. Linguistics (23)
  - PA Classical philology (1)
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  - PE English (313)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (25)
  - PN Literature (General) (4)
    - PN0441 Literary History (2)
  - PR English literature (91)
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- Q Science (1343)
  - Q Science (General) (537)
  - QA Mathematics (204)
    - QA75 Electronic computers. Computer science (7)
    - QA76 Computer software (4)
  - QC Physics (223)
  - QD Chemistry (185)
  - QE Geology (6)
  - QH Natural history (17)
    - QH301 Biology (11)
  - QK Botany (20)
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  - QM Human anatomy (7)
  - QP Physiology (2)
  - QR Microbiology (155)
    - QR180 Immunology (20)
    - QR355 Virology (2)
- R Medicine (810)
  - R Medicine (General) (710)
  - RA Public aspects of medicine (3)
    - RA0421 Public health. Hygiene. Preventive Medicine (2)
  - RB Pathology (2)
  - RC Internal medicine (16)
  - RF Otorhinolaryngology (14)
  - RL Dermatology (1)
  - RM Therapeutics. Pharmacology (4)
  - RS Pharmacy and materia medica (80)
  - RZ Other systems of medicine (4)
- S Agriculture (5515)
  - S Agriculture (General) (2839)
  - SB Plant culture (1057)
  - SD Forestry (351)
  - SF Animal culture (1132)
  - SH Aquaculture. Fisheries. Angling (159)
- T Technology (2372)
  - T Technology (General) (1638)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (374)
  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (23)
  - TJ Mechanical engineering and machinery (126)
  - TK Electrical engineering. Electronics Nuclear engineering (194)
  - TP Chemical technology (3)
  - TS Manufactures (15)
  - TX Home economics (3)
- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (2)
  - Z665 Library Science. Information Science (1)
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    - ZA4450 Databases (1)