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Library of Congress Subject Areas (14)
- Q Science (6)
  - QA Mathematics (3)
    - QA75 Electronic computers. Computer science (3)
  - QC Physics (2)
  - QD Chemistry (2)
- R Medicine (4)
  - R Medicine (General) (1)
  - RS Pharmacy and materia medica (4)
- T Technology (7)
  - T Technology (General) (4)
  - TD Environmental technology. Sanitary engineering (1)
  - TK Electrical engineering. Electronics Nuclear engineering (2)
  - TP Chemical technology (2)