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Library of Congress Subject Areas (4621)
- A General Works (72)
  - AC Collections. Series. Collected works (25)
  - AI Indexes (General) (15)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (38)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (50)
  - B Philosophy (General) (10)
  - BC Logic (3)
  - BD Speculative Philosophy (1)
  - BF Psychology (34)
  - BH Aesthetics (1)
  - BJ Ethics (3)
  - BL Religion (4)
  - BM Judaism (1)
  - BP Islam. Bahaism. Theosophy, etc (2)
  - BQ Buddhism (1)
  - BR Christianity (1)
  - BS The Bible (1)
  - BT Doctrinal Theology (1)
  - BV Practical Theology (8)
    - BV1460 Religious Education (1)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (4)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
  - CC Archaeology (1)
  - CD Diplomatics. Archives. Seals (3)
    - CD921 Archives (1)
  - CE Technical chronology. Calendar (1)
  - CJ Numismatics (1)
  - CN Inscriptions. Epigraphy. (1)
  - CR Heraldry (1)
  - CS Genealogy (2)
  - CT Biography (1)
- D History General and Old World (3)
  - D History (General) (3)
    - D051 Ancient History (1)
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    - D204 Modern History (1)
    - D501 World War I (1)
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    - D839 Post-war History, 1945 on (1)
    - D880 Developing Countries (1)
    - D890 Eastern Hemisphere (1)
    - D901 Europe (General) (1)
  - DA Great Britain (2)
    - DAW Central Europe (1)
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  - DE The Mediterranean Region. The Greco-Roman World (1)
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    - DJK Eastern Europe (1)
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  - DL Northern Europe. Scandinavia (1)
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- E History America (2)
  - E11 America (General) (2)
  - E151 United States (General) (1)
- F History United States, Canada, Latin America (2)
  - F001 United States local history (2)
  - F1001 Canada (General) (1)
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- G Geography. Anthropology. Recreation (12)
  - G Geography (General) (10)
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- H Social Sciences (82)
  - H Social Sciences (General) (43)
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  - HB Economic Theory (1)
  - HC Economic History and Conditions (3)
  - HD Industries. Land use. Labor (5)
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  - HN Social history and conditions. Social problems. Social reform (4)
  - HQ The family. Marriage. Woman (15)
  - HS Societies secret benevolent etc (2)
  - HT Communities. Classes. Races (3)
  - HV Social pathology. Social and public welfare (5)
  - HX Socialism. Communism. Anarchism (1)
- J Political Science (2)
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  - JV Colonies and colonization. Emigration and immigration. International migration (1)
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- K Law (25)
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    - KDC Scotland (1)
  - KF United States Federal Law (1)
  - KZ Law of Nations (4)
- L Education (1359)
  - L Education (General) (1228)
  - LA History of education (29)
  - LB Theory and practice of education (182)
    - LB1501 Primary Education (31)
    - LB1603 Secondary Education. High schools (15)
    - LB2300 Higher Education (14)
    - LB2361 Curriculum (9)
  - LC Special aspects of education (27)
    - LC5201 Education extension. Adult education. Continuing education (7)
  - LD Individual institutions (United States) (10)
  - LE Individual institutions (America except United States) (7)
  - LF Individual institutions (Europe) (7)
  - LG Individual institutions (Asia. Africa) (8)
  - LT Textbooks (27)
- M Music and Books on Music (13)
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  - MT Musical instruction and study (2)
- N Fine Arts (5)
  - N Visual arts (General) For photography, see TR (2)
  - NA Architecture (1)
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  - NK Decorative arts Applied arts Decoration and ornament (1)
  - NX Arts in general (1)
- P Language and Literature (8)
  - P Philology. Linguistics (2)
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  - PM Hyperborean, Indian, and Artificial languages (1)
  - PN Literature (General) (5)
    - PN0080 Criticism (1)
    - PN0441 Literary History (2)
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    - PN2000 Dramatic representation. The Theater (1)
  - PQ Romance literatures (1)
  - PR English literature (1)
  - PS American literature (1)
  - PT Germanic literature (1)
  - PZ Childrens literature (2)
- Q Science (180)
  - Q Science (General) (119)
  - QA Mathematics (2)
    - QA75 Electronic computers. Computer science (1)
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  - QB Astronomy (1)
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  - QD Chemistry (22)
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  - QH Natural history (6)
    - QH301 Biology (5)
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  - QK Botany (12)
  - QL Zoology (1)
  - QM Human anatomy (10)
  - QP Physiology (17)
  - QR Microbiology (23)
    - QR180 Immunology (2)
    - QR355 Virology (2)
- R Medicine (3933)
  - R Medicine (General) (1759)
  - RA Public aspects of medicine (268)
    - RA0421 Public health. Hygiene. Preventive Medicine (138)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (13)
  - RB Pathology (44)
  - RC Internal medicine (59)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (6)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (9)
    - RC1200 Sports Medicine (2)
  - RD Surgery (31)
  - RE Ophthalmology (2)
  - RF Otorhinolaryngology (1)
  - RG Gynecology and obstetrics (834)
  - RJ Pediatrics (144)
    - RJ101 Child Health. Child health services (62)
  - RK Dentistry (372)
  - RL Dermatology (15)
  - RM Therapeutics. Pharmacology (117)
  - RS Pharmacy and materia medica (235)
  - RT Nursing (1117)
  - RV Botanic, Thomsonian, and eclectic medicine (21)
  - RX Homeopathy (3)
  - RZ Other systems of medicine (310)
- S Agriculture (6)
  - S Agriculture (General) (2)
  - SB Plant culture (2)
  - SD Forestry (1)
  - SF Animal culture (2)
  - SH Aquaculture. Fisheries. Angling (3)
  - SK Hunting sports (1)
- T Technology (164)
  - T Technology (General) (158)
    - T201 Patents. Trademarks (2)
  - TA Engineering (General). Civil engineering (General) (2)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (2)
  - TE Highway engineering. Roads and pavements (1)
  - TF Railroad engineering and operation (1)
  - TG Bridge engineering (1)
  - TH Building construction (1)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (1)
  - TL Motor vehicles. Aeronautics. Astronautics (1)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (5)
  - TR Photography (1)
  - TS Manufactures (1)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (1)
- U Military Science (2)
  - U Military Science (General) (2)
- V Naval Science (2)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (106)
  - Z004 Books. Writing. Paleography (7)
  - Z665 Library Science. Information Science (49)
  - Z719 Libraries (General) (38)
  - ZA Information resources (42)
    - ZA4050 Electronic information resources (20)
    - ZA4450 Databases (2)