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Library of Congress Subject Areas (5688)
- A General Works (کلیات) (3)
  - AC Collections. Series. Collected works (2)
  - AS Academies and learned societies (General) (1)
- H Social Sciences (3)
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- L Education (13)
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- Q Science (13)
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- QV pharmacology (31)
- QW Microbiology and Immunology (4)
- QY Clinical Pathology (28)
- QZ Pathology (63)
- R Medicine (4875)
  - R Medicine (General) (2346)
  - RC Internal medicine (1046)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (4)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1036)
  - RD Surgery (455)
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  - RK Dentistry (60)
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- T Technology (3)
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- WU Dentistry. Oral surgery (97)
- WV Otolaryngology (2)
- WW Ophthalmology (26)
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- Z Bibliography. Library Science. Information Resources (159)
  - Z665 Library Science. Information Science (5)
  - ZA Information resources (154)
    - ZA4450 Databases (1)