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Library of Congress Subject Areas (909)
- A General Works (3)
  - AS Academies and learned societies (General) (3)
- H Social Sciences (5)
  - H Social Sciences (General) (1)
  - HB Economic Theory (3)
  - HF Commerce (1)
- L Education (1)
  - L Education (General) (1)
- P Language and Literature (1)
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- Q Science (204)
  - Q Science (General) (105)
  - QD Chemistry (37)
  - QM Human anatomy (1)
  - QP Physiology (6)
  - QR Microbiology (55)
    - QR180 Immunology (2)
- R Medicine (680)
  - R Medicine (General) (149)
  - RA Public aspects of medicine (10)
  - RB Pathology (3)
  - RD Surgery (3)
  - RG Gynecology and obstetrics (1)
  - RK Dentistry (2)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (14)
  - RS Pharmacy and materia medica (512)
  - RV Botanic, Thomsonian, and eclectic medicine (3)
- T Technology (16)
  - T Technology (General) (16)