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Library of Congress Subject Areas (1920)
- A General Works (1)
  - AC Collections. Series. Collected works (1)
- D History General and Old World (1)
  - D History (General) (1)
- G Geography. Anthropology. Recreation (47)
  - G Geography (General) (43)
  - GE Environmental Sciences (4)
- H Social Sciences (3)
  - H Social Sciences (General) (2)
  - HG Finance (1)
- J Political Science (2)
  - J General legislative and executive papers (2)
  - JC Political theory (1)
- L Education (733)
  - L Education (General) (730)
  - LA History of education (3)
- M Music and Books on Music (1)
  - M Music (1)
- Q Science (295)
  - Q Science (General) (246)
  - QA Mathematics (26)
  - QC Physics (5)
  - QD Chemistry (5)
  - QK Botany (8)
  - QL Zoology (7)
  - QP Physiology (1)
- R Medicine (289)
  - R Medicine (General) (289)
- S Agriculture (15)
  - S Agriculture (General) (15)
- T Technology (575)
  - T Technology (General) (565)
  - TA Engineering (General). Civil engineering (General) (9)
  - TJ Mechanical engineering and machinery (1)