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Library of Congress Subject Areas (5026)
- A Accountant (3)
- A General Works (50)
  - AC Collections. Series. Collected works (43)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (2)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (56)
  - B Philosophy (General) (4)
  - BF Psychology (52)
- D History General and Old World (48)
  - D History (General) (48)
- G Geography (12)
- G Geography. Anthropology. Recreation (54)
  - G Geography (General) (35)
  - GA Mathematical geography. Cartography (1)
  - GE Environmental Sciences (2)
  - GT Manners and customs (17)
- H Social Sciences (223)
  - H Social Sciences (General) (72)
  - HA Statistics (39)
  - HB Economic Theory (24)
  - HC Economic History and Conditions (1)
  - HD Industries. Land use. Labor (31)
    - HD28 Management. Industrial Management (29)
    - HD61 Risk Management (2)
  - HE Transportation and Communications (10)
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    - HF5601 Accounting (4)
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  - HN Social history and conditions. Social problems. Social reform (1)
  - HQ The family. Marriage. Woman (17)
  - HT Communities. Classes. Races (1)
- J Political Science (1)
  - JC Political theory (1)
- K Law (3)
  - K Law (General) (3)
- L Education (1633)
  - L Education (General) (904)
  - LA History of education (1)
  - LB Theory and practice of education (385)
    - LB1501 Primary Education (83)
    - LB1603 Secondary Education. High schools (147)
    - LB2300 Higher Education (13)
    - LB2361 Curriculum (11)
  - LC Special aspects of education (437)
    - LC5201 Education extension. Adult education. Continuing education (39)
- M Music and Books on Music (5)
  - M Music (2)
  - ML Literature of music (3)
  - MT Musical instruction and study (1)
- N Fine Arts (162)
  - N Visual arts (General) For photography, see TR (21)
  - NB Sculpture (1)
  - NC Drawing Design Illustration (6)
  - ND Painting (2)
  - NK Decorative arts Applied arts Decoration and ornament (73)
  - NX Arts in general (61)
- O Food (125)
- P Language and Literature (129)
  - P Philology. Linguistics (63)
  - PA Classical philology (1)
  - PC Romance languages (1)
  - PE English (38)
  - PI Oriental languages and literatures (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (5)
  - PN Literature (General) (41)
  - PQ Romance literatures (1)
  - PR English literature (6)
- Q Science (254)
  - Q Science (General) (18)
  - QA Mathematics (132)
    - QA75 Electronic computers. Computer science (1)
  - QC Physics (56)
  - QD Chemistry (48)
  - QH Natural history (9)
    - QH301 Biology (8)
  - QK Botany (1)
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- R Medicine (62)
  - R Medicine (General) (9)
  - RA Public aspects of medicine (4)
    - RA0421 Public health. Hygiene. Preventive Medicine (4)
  - RC Internal medicine (50)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1)
    - RC1200 Sports Medicine (48)
- S Agriculture (5)
  - S Agriculture (General) (1)
  - SB Plant culture (1)
  - SD Forestry (1)
  - SH Aquaculture. Fisheries. Angling (2)
- S Sport (602)
- T Technology (2272)
  - T Technology (General) (125)
  - TA Engineering (General). Civil engineering (General) (353)
  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (2)
  - TE Highway engineering. Roads and pavements (6)
  - TH Building construction (146)
  - TJ Mechanical engineering and machinery (316)
  - TK Electrical engineering. Electronics Nuclear engineering (543)
  - TL Motor vehicles. Aeronautics. Astronautics (22)
  - TN Mining engineering. Metallurgy (575)
  - TT Handicrafts Arts and crafts (78)
  - TX Home economics (122)
- Z Bibliography. Library Science. Information Resources (17)
  - Z004 Books. Writing. Paleography (1)
  - Z665 Library Science. Information Science (6)
  - Z719 Libraries (General) (3)
  - ZA Information resources (9)
    - ZA4050 Electronic information resources (2)
    - ZA4450 Databases (1)