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Library of Congress Subject Areas (6609)
- A General Works (کلیات) (3)
  - AC Collections. Series. Collected works (2)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (1)
  - BF Psychology (1)
- H Social Sciences (3)
  - H Social Sciences (General) (3)
- L Education (13)
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  - LA History of education (1)
- Q Science (13)
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- QS Human Anatomy (9)
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- QU Biochemistry (30)
- QV pharmacology (55)
- QW Microbiology and Immunology (57)
- QX Parasitology (10)
- 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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  - TD Environmental technology. Sanitary engineering (20)
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  - U Military Science (General) (1)
- W General Medicine , Health professions (13)
- WA Public Health (387)
- WB Practice of Medicine (147)
- WC Communicable Diseases (23)
- WD Nutrition Disease and metabolic diseases (8)
- WE Musculoskeletal system (11)
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- WG Cardiovascular System (54)
- WH Hemic and Lymphatic System (30)
- WI Digestive System (3)
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- WK Endocrine System (38)
- WL Nervous system (27)
- WM Psychiatry (18)
- WN Radiology . Diagnostic Imaging (33)
- WO Surgery (7)
- WP Gynecology (31)
- WQ Obstetrics (13)
- WR Dermatology (26)
- WS Pediatrics (151)
- WT Geriatrics . Chronic Diseases (7)
- WU Dentistry. Oral surgery (157)
- WV Otolaryngology (2)
- WW Ophthalmology (28)
- WX Hospital and other health Facilities (3)
- WY Nursing (98)
- 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)