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Library of Congress Subject Areas (28)
- Q Science (28)
  - Q Science (General) (26)
  - QD Chemistry (14)
  - QL Zoology (1)
  - QR Microbiology (12)
- R Medicine (7)
  - R Medicine (General) (4)
  - RB Pathology (1)
  - RM Therapeutics. Pharmacology (1)
  - RS Pharmacy and materia medica (3)