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Library of Congress Subject Areas (4657)
- A General Works (109)
  - AC Collections. Series. Collected works (21)
  - AI Indexes (General) (31)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (57)
    - Hotels Industry (43)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (9)
  - B Philosophy (General) (1)
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  - BP Islam. Bahaism. Theosophy, etc (2)
- C Auxiliary Sciences of History (7)
  - C Auxiliary sciences of history (General) (1)
  - CD Diplomatics. Archives. Seals (4)
    - CD921 Archives (3)
  - 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)
  - F001 United States local history (4)
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- G Geography. Anthropology. Recreation (4)
  - G Geography (General) (1)
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  - GF Human ecology. Anthropogeography (2)
- H Social Sciences (1376)
  - H Social Sciences (General) (110)
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  - HB Economic Theory (77)
  - HC Economic History and Conditions (27)
  - HD Industries. Land use. Labor (10)
    - HD28 Management. Industrial Management (5)
    - HD61 Risk Management (4)
  - HE Transportation and Communications (4)
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    - HF5601 Accounting (1063)
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  - HN Social history and conditions. Social problems. Social reform (14)
  - HQ The family. Marriage. Woman (3)
  - HV Social pathology. Social and public welfare (5)
  - Perhotelan (16)
- J Political Science (15)
  - J General legislative and executive papers (2)
  - JF Political institutions (General) (2)
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- K Law (3)
  - K Law (General) (3)
- L Education (147)
  - L Education (General) (113)
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    - LB1501 Primary Education (12)
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    - LC5201 Education extension. Adult education. Continuing education (3)
  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (7)
  - M Music (6)
  - ML Literature of music (1)
  - MT Musical instruction and study (2)
- N Fine Arts (117)
  - N Visual arts (General) For photography, see TR (58)
  - NA Architecture (3)
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  - NX Arts in general (19)
- P Language and Literature (11)
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  - PM Hyperborean, Indian, and Artificial languages (1)
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    - PN1993 Motion Pictures (4)
  - PZ Childrens literature (6)
- Q Science (586)
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    - QA75 Electronic computers. Computer science (354)
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    - QR355 Virology (3)
- R Medicine (1031)
  - R Medicine (General) (123)
  - RA Public aspects of medicine (288)
    - RA0421 Public health. Hygiene. Preventive Medicine (240)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (4)
  - RB Pathology (21)
  - RC Internal medicine (37)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
    - RC1200 Sports Medicine (1)
  - RD Surgery (1)
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  - RM Therapeutics. Pharmacology (41)
  - RS Pharmacy and materia medica (443)
  - RT Nursing (110)
  - RV Botanic, Thomsonian, and eclectic medicine (12)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (30)
- S Agriculture (23)
  - S Agriculture (General) (15)
  - SB Plant culture (9)
  - SD Forestry (1)
  - SH Aquaculture. Fisheries. Angling (3)
- T Technology (1657)
  - T Technical Information (629)
    - Technical Information (115)
      - A General Works (109)
        AC Collections. Series. Collected works (21)
        AI Indexes (General) (31)
        AM Museums (General). Collectors and collecting (General) (1)
        AS Academies and learned societies (General) (57)
        Hotels Industry (43)
        AZ History of Scholarship The Humanities (1)
  - TA Engineering (General). Civil engineering (General) (159)
  - TC Hydraulic engineering. Ocean engineering (7)
  - TD Environmental technology. Sanitary engineering (42)
  - TE Highway engineering. Roads and pavements (5)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (4)
  - TH Building construction (9)
  - TJ Mechanical engineering and machinery (397)
  - TK Electrical engineering. Electronics Nuclear engineering (122)
  - TL Motor vehicles. Aeronautics. Astronautics (34)
  - TN Mining engineering. Metallurgy (38)
  - TP Chemical technology (22)
  - TR Photography (7)
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  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (40)
- U Military Science (1)
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- V Naval Science (1)
  - V Naval Science (General) (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (15)
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  - Z665 Library Science. Information Science (8)
  - Z719 Libraries (General) (3)
  - ZA Information resources (6)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (2)