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Library of Congress Subject Areas (121)
- A General Works (1)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (9)
  - B Philosophy (General) (1)
  - BF Psychology (8)
- G Geography. Anthropology. Recreation (2)
  - G Geography (General) (1)
  - GF Human ecology. Anthropogeography (1)
  - GN Anthropology (1)
- H Social Sciences (26)
  - H Social Sciences (General) (20)
  - HB Economic Theory (7)
  - HC Economic History and Conditions (2)
  - HD Industries. Land use. Labor (3)
    - HD28 Management. Industrial Management (2)
  - HF Commerce (2)
  - HG Finance (1)
  - HM Sociology (1)
  - HN Social history and conditions. Social problems. Social reform (4)
  - HQ The family. Marriage. Woman (2)
- K Law (1)
  - K Law (General) (1)
- L Education (40)
  - L Education (General) (39)
  - LA History of education (1)
  - LB Theory and practice of education (6)
    - LB1501 Primary Education (2)
    - LB1603 Secondary Education. High schools (1)
    - LB2300 Higher Education (1)
    - LB2361 Curriculum (2)
  - LT Textbooks (2)
- P Language and Literature (7)
  - PE English (7)
  - PR English literature (4)
- Q Science (28)
  - Q Science (General) (21)
  - QD Chemistry (6)
  - QH Natural history (1)
  - QL Zoology (5)
  - QM Human anatomy (3)
  - QP Physiology (1)
  - QR Microbiology (3)
    - QR180 Immunology (1)
- R Medicine (36)
  - R Medicine (General) (28)
  - RA Public aspects of medicine (6)
    - RA0421 Public health. Hygiene. Preventive Medicine (1)
  - RB Pathology (1)
  - RC Internal medicine (2)
  - RG Gynecology and obstetrics (4)
  - RK Dentistry (3)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (4)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (9)
- S Agriculture (4)
  - S Agriculture (General) (4)
- T Technology (9)
  - T Technology (General) (6)
  - TA Engineering (General). Civil engineering (General) (2)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (1)
  - TH Building construction (1)