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Library of Congress Subject Areas (6671)
- A General Works (کلیات) (3)
  - AC Collections. Series. Collected works (2)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (1)
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- H Social Sciences (3)
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- L Education (13)
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- QS Human Anatomy (9)
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- QU Biochemistry (34)
- QV pharmacology (55)
- QW Microbiology and Immunology (60)
- QX Parasitology (16)
- QY Clinical Pathology (32)
- QZ Pathology (81)
- R Medicine (4703)
  - Environmental Health (1)
  - R Medicine (General) (2351)
  - RC Internal medicine (1046)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (4)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1036)
  - RD Surgery (455)
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  - RZ Other systems of medicine (550)
- T Technology (22)
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- W General Medicine , Health professions (23)
- WA Public Health (407)
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- WC Communicable Diseases (24)
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- WG Cardiovascular System (57)
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- WN Radiology . Diagnostic Imaging (34)
- WO Surgery (7)
- WP Gynecology (33)
- WQ Obstetrics (14)
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- WS Pediatrics (152)
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- WU Dentistry. Oral surgery (157)
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- WW Ophthalmology (28)
- WX Hospital and other health Facilities (4)
- WY Nursing (99)
- WZ History of Medicine (1)
- Z Bibliography. Library Science. Information Resources (248)
  - Z665 Library Science. Information Science (6)
  - ZA Information resources (242)
    - ZA4450 Databases (1)