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Library of Congress Subject Areas (4019)
- A General Works (98)
  - AC Collections. Series. Collected works (17)
  - AI Indexes (General) (30)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (51)
    - Hotels Industry (41)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (6)
  - BF Psychology (4)
  - BP Islam. Bahaism. Theosophy, etc (2)
- C Auxiliary Sciences of History (5)
  - C Auxiliary sciences of history (General) (1)
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  - CE Technical chronology. Calendar (2)
- D History General and Old World (3)
  - D History (General) (3)
    - D051 Ancient History (1)
    - D839 Post-war History, 1945 on (2)
- E History America (1)
  - E151 United States (General) (1)
- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (3)
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  - GF Human ecology. Anthropogeography (2)
- H Social Sciences (1256)
  - H Social Sciences (General) (89)
  - HA Statistics (7)
  - HB Economic Theory (66)
  - HC Economic History and Conditions (27)
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    - HD28 Management. Industrial Management (3)
    - HD61 Risk Management (2)
  - HE Transportation and Communications (3)
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    - HF5601 Accounting (991)
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  - HN Social history and conditions. Social problems. Social reform (13)
  - HQ The family. Marriage. Woman (2)
  - HV Social pathology. Social and public welfare (3)
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- J Political Science (9)
  - J General legislative and executive papers (2)
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  - JS Local government Municipal government (6)
- K Law (3)
  - K Law (General) (3)
- L Education (113)
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    - LC5201 Education extension. Adult education. Continuing education (2)
  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (5)
  - M Music (4)
  - ML Literature of music (1)
  - MT Musical instruction and study (2)
- N Fine Arts (77)
  - N Visual arts (General) For photography, see TR (49)
  - NA Architecture (2)
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- P Language and Literature (4)
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    - PN1993 Motion Pictures (2)
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- Q Science (521)
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    - QR355 Virology (3)
- R Medicine (852)
  - R Medicine (General) (70)
  - RA Public aspects of medicine (247)
    - RA0421 Public health. Hygiene. Preventive Medicine (237)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (20)
  - RC Internal medicine (5)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
  - RG Gynecology and obstetrics (99)
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    - RJ101 Child Health. Child health services (3)
  - RL Dermatology (4)
  - RM Therapeutics. Pharmacology (23)
  - RS Pharmacy and materia medica (371)
  - RT Nursing (53)
  - RV Botanic, Thomsonian, and eclectic medicine (6)
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  - RZ Other systems of medicine (24)
- S Agriculture (21)
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  - SB Plant culture (9)
  - SD Forestry (1)
  - SH Aquaculture. Fisheries. Angling (2)
- T Technology (1343)
  - T Technical Information (486)
    - Technical Information (104)
      - A General Works (98)
        AC Collections. Series. Collected works (17)
        AI Indexes (General) (30)
        AM Museums (General). Collectors and collecting (General) (1)
        AS Academies and learned societies (General) (51)
        Hotels Industry (41)
        AZ History of Scholarship The Humanities (1)
  - TA Engineering (General). Civil engineering (General) (138)
  - TC Hydraulic engineering. Ocean engineering (6)
  - TD Environmental technology. Sanitary engineering (31)
  - TE Highway engineering. Roads and pavements (5)
  - TF Railroad engineering and operation (6)
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  - TH Building construction (7)
  - TJ Mechanical engineering and machinery (353)
  - TK Electrical engineering. Electronics Nuclear engineering (87)
  - TL Motor vehicles. Aeronautics. Astronautics (24)
  - TN Mining engineering. Metallurgy (33)
  - TP Chemical technology (18)
  - TR Photography (4)
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  - TX Home economics (38)
- U Military Science (1)
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- V Naval Science (1)
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  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (13)
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  - Z665 Library Science. Information Science (5)
  - Z719 Libraries (General) (2)
  - ZA Information resources (6)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (3)