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Library of Congress Subject Areas (5445)
- A General Works (کلیات) (3)
  - AC Collections. Series. Collected works (2)
  - AS Academies and learned societies (General) (1)
- H Social Sciences (3)
  - H Social Sciences (General) (3)
- L Education (13)
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- Q Science (13)
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- QS Human Anatomy (1)
- QT Physiology (1)
- QV pharmacology (31)
- QW Microbiology and Immunology (4)
- QY Clinical Pathology (28)
- QZ Pathology (63)
- R Medicine (4893)
  - R Medicine (General) (2346)
  - RC Internal medicine (1046)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (4)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1036)
  - RD Surgery (455)
  - RG Gynecology and obstetrics (120)
  - RK Dentistry (79)
  - RT Nursing (336)
  - RZ Other systems of medicine (548)
- T Technology (3)
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  - U Military Science (General) (1)
- W General Medicine , Health professions (2)
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- WB Practice of Medicine (98)
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- WG Cardiovascular System (1)
- WH Hemic and Lymphatic System (4)
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- WR Dermatology (22)
- WS Pediatrics (141)
- WT Geriatrics . Chronic Diseases (1)
- WU Dentistry. Oral surgery (78)
- WV Otolaryngology (2)
- WW Ophthalmology (26)
- WY Nursing (1)
- Z Bibliography. Library Science. Information Resources (6)
  - Z665 Library Science. Information Science (4)
  - ZA Information resources (2)
    - ZA4450 Databases (1)