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Library of Congress Subject Areas (15797)
- A General Works (6)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (1145)
  - B Philosophy (General) (89)
  - BC Logic (6)
  - BD Speculative Philosophy (4)
  - BF Psychology (984)
  - BH Aesthetics (7)
  - BJ Ethics (27)
  - BL Religion (43)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (16)
  - BR Christianity (4)
  - BV Practical Theology (3)
    - BV1460 Religious Education (2)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
  - CC Archaeology (6)
  - CD Diplomatics. Archives. Seals (5)
    - CD921 Archives (1)
  - CT Biography (9)
- D History General and Old World (232)
  - D History (General) (87)
    - D204 Modern History (15)
    - D501 World War I (4)
    - D731 World War II (2)
    - D839 Post-war History, 1945 on (3)
    - D880 Developing Countries (1)
    - D901 Europe (General) (6)
  - DA Great Britain (83)
    - DAW Central Europe (1)
  - DC France (3)
  - DE The Mediterranean Region. The Greco-Roman World (5)
  - DF Greece (10)
  - DG Italy (1)
  - DJ Netherlands (Holland) (3)
    - DJK Eastern Europe (3)
  - DK Russia. Soviet Union. Former Soviet Republics (12)
  - DL Northern Europe. Scandinavia (4)
  - DR Balkan Peninsula (4)
  - DS Asia (31)
  - DT Africa (16)
  - DU Oceania (South Seas) (2)
- E History America (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (3)
  - F001 United States local history (2)
  - F1201 Latin America (General) (1)
- G Geography. Anthropology. Recreation (772)
  - G Geography (General) (58)
  - GA Mathematical geography. Cartography (5)
  - GB Physical geography (20)
  - GC Oceanography (5)
  - GE Environmental Sciences (337)
  - GF Human ecology. Anthropogeography (36)
  - GN Anthropology (22)
  - GR Folklore (4)
  - GT Manners and customs (6)
  - GV Recreation Leisure (341)
- H Social Sciences (3459)
  - H Social Sciences (General) (769)
  - HA Statistics (43)
  - HB Economic Theory (487)
  - HC Economic History and Conditions (129)
  - HD Industries. Land use. Labor (976)
    - HD28 Management. Industrial Management (265)
    - HD61 Risk Management (22)
  - HE Transportation and Communications (104)
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    - HF5601 Accounting (149)
  - HG Finance (350)
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  - HM Sociology (273)
  - HN Social history and conditions. Social problems. Social reform (133)
  - HQ The family. Marriage. Woman (76)
  - HS Societies secret benevolent etc (8)
  - HT Communities. Classes. Races (128)
  - HV Social pathology. Social and public welfare (142)
  - HX Socialism. Communism. Anarchism (7)
- J Political Science (144)
  - J General legislative and executive papers (1)
  - JA Political science (General) (36)
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  - JN Political institutions (Europe) (48)
    - JN101 Great Britain (7)
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  - JV Colonies and colonization. Emigration and immigration. International migration (3)
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- K Law (616)
  - K Law (General) (406)
  - KD England and Wales (215)
    - KDC Scotland (1)
  - KF United States Federal Law (3)
  - KZ Law of Nations (21)
- L Education (1196)
  - L Education (General) (402)
  - LA History of education (13)
  - LB Theory and practice of education (810)
    - LB1501 Primary Education (101)
    - LB1603 Secondary Education. High schools (36)
    - LB2300 Higher Education (346)
    - LB2361 Curriculum (16)
  - LC Special aspects of education (144)
    - LC5201 Education extension. Adult education. Continuing education (56)
  - LF Individual institutions (Europe) (1)
  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (2)
- M Music and Books on Music (99)
  - M Music (78)
  - ML Literature of music (3)
  - MT Musical instruction and study (19)
- N Fine Arts (592)
  - N Visual arts (General) For photography, see TR (207)
  - NA Architecture (308)
  - NB Sculpture (3)
  - NC Drawing Design Illustration (7)
  - ND Painting (6)
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  - NK Decorative arts Applied arts Decoration and ornament (9)
  - NX Arts in general (87)
- P Language and Literature (750)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (22)
  - PN Literature (General) (447)
    - PN0080 Criticism (82)
    - PN0441 Literary History (9)
    - PN1990 Broadcasting (11)
    - PN1993 Motion Pictures (66)
    - PN2000 Dramatic representation. The Theater (105)
  - PQ Romance literatures (8)
  - PR English literature (127)
  - PS American literature (12)
  - PT Germanic literature (2)
  - PZ Childrens literature (8)
- Q Science (4178)
  - Q Science (General) (404)
  - QA Mathematics (2460)
    - QA75 Electronic computers. Computer science (946)
    - QA76 Computer software (635)
  - QB Astronomy (1)
  - QC Physics (329)
  - QD Chemistry (793)
  - QE Geology (57)
  - QH Natural history (213)
    - QH301 Biology (125)
    - QH426 Genetics (21)
  - QK Botany (67)
  - QL Zoology (136)
  - QM Human anatomy (35)
  - QP Physiology (196)
  - QR Microbiology (92)
    - QR180 Immunology (1)
    - QR355 Virology (23)
- R Medicine (1619)
  - R Medicine (General) (312)
  - RA Public aspects of medicine (355)
    - RA0421 Public health. Hygiene. Preventive Medicine (215)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (12)
  - RC Internal medicine (215)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (52)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (29)
    - RC1200 Sports Medicine (60)
  - RD Surgery (11)
  - RE Ophthalmology (12)
  - RF Otorhinolaryngology (1)
  - RG Gynecology and obstetrics (42)
  - RJ Pediatrics (41)
    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (55)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (175)
  - RS Pharmacy and materia medica (266)
  - RT Nursing (305)
  - RV Botanic, Thomsonian, and eclectic medicine (13)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (56)
- S Agriculture (1619)
  - S Agriculture (General) (1285)
  - SB Plant culture (493)
  - SD Forestry (45)
  - SF Animal culture (78)
  - SH Aquaculture. Fisheries. Angling (52)
- T Technology (2790)
  - T Technology (General) (591)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1075)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (215)
  - TE Highway engineering. Roads and pavements (9)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (169)
  - TJ Mechanical engineering and machinery (145)
  - TK Electrical engineering. Electronics Nuclear engineering (568)
  - TL Motor vehicles. Aeronautics. Astronautics (94)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (151)
  - TR Photography (21)
  - TS Manufactures (137)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (19)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (71)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (107)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (19)
  - Z719 Libraries (General) (4)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (2)