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Library of Congress Subject Areas (543)
- A General Works (2)
  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (18)
  - BF Psychology (4)
  - BL Religion (2)
  - BP Islam. Bahaism. Theosophy, etc (12)
- D History General and Old World (4)
  - D History (General) (2)
  - DS Asia (2)
- G Geography. Anthropology. Recreation (23)
  - GB Physical geography (1)
  - GC Oceanography (1)
  - GF Human ecology. Anthropogeography (1)
  - GV Recreation Leisure (21)
- H Social Sciences (137)
  - H Social Sciences (General) (50)
  - HA Statistics (7)
  - HC Economic History and Conditions (3)
  - HD Industries. Land use. Labor (84)
    - HD28 Management. Industrial Management (52)
    - HD61 Risk Management (35)
  - HE Transportation and Communications (9)
  - HF Commerce (4)
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  - HJ Public Finance (1)
  - HM Sociology (6)
  - HN Social history and conditions. Social problems. Social reform (44)
  - HQ The family. Marriage. Woman (2)
  - HS Societies secret benevolent etc (2)
  - HT Communities. Classes. Races (7)
  - HV Social pathology. Social and public welfare (15)
  - HX Socialism. Communism. Anarchism (2)
- J Political Science (13)
  - J General legislative and executive papers (1)
  - JA Political science (General) (4)
  - JF Political institutions (General) (1)
  - JQ Political institutions Asia (1)
  - JZ International relations (7)
- K Law (3)
  - K Law (General) (2)
  - KZ Law of Nations (1)
- L Education (30)
  - L Education (General) (17)
  - LA History of education (2)
  - LB Theory and practice of education (17)
    - LB2300 Higher Education (12)
  - LC Special aspects of education (5)
    - LC5201 Education extension. Adult education. Continuing education (1)
- P Language and Literature (27)
  - P Philology. Linguistics (23)
  - PB Modern European Languages (1)
  - PC Romance languages (1)
  - PE English (4)
  - PI Oriental languages and literatures (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (2)
  - PN Literature (General) (10)
    - PN0080 Criticism (5)
    - PN0441 Literary History (3)
  - PR English literature (3)
- Q Science (155)
  - Q Science (General) (54)
  - QA Mathematics (77)
    - QA75 Electronic computers. Computer science (61)
    - QA76 Computer software (10)
  - QC Physics (37)
  - QD Chemistry (30)
  - QE Geology (2)
  - QH Natural history (16)
    - QH301 Biology (16)
  - QM Human anatomy (1)
  - QR Microbiology (2)
- R Medicine (26)
  - R Medicine (General) (19)
  - RA Public aspects of medicine (12)
    - RA0421 Public health. Hygiene. Preventive Medicine (7)
  - RB Pathology (2)
  - RC Internal medicine (1)
    - RC1200 Sports Medicine (1)
  - RG Gynecology and obstetrics (1)
  - RJ Pediatrics (1)
    - RJ101 Child Health. Child health services (1)
  - RM Therapeutics. Pharmacology (1)
- S Agriculture (2)
  - S Agriculture (General) (1)
  - SK Hunting sports (1)
- T Technology (283)
  - T Technology (General) (144)
  - TA Engineering (General). Civil engineering (General) (100)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (22)
  - TE Highway engineering. Roads and pavements (5)
  - TF Railroad engineering and operation (2)
  - TH Building construction (8)
  - TJ Mechanical engineering and machinery (76)
  - TK Electrical engineering. Electronics Nuclear engineering (67)
  - TL Motor vehicles. Aeronautics. Astronautics (25)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (17)
  - TS Manufactures (10)
- U Military Science (45)
  - U Military Science (General) (45)
- V Naval Science (5)
  - V Naval Science (General) (4)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)