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Library of Congress Subject Areas (6840)
- 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 (14)
  - Q Science (General) (13)
  - QD Chemistry (1)
- QS Human Anatomy (10)
- QT Physiology (12)
- QU Biochemistry (54)
- QV pharmacology (64)
- QW Microbiology and Immunology (69)
- QX Parasitology (17)
- QY Clinical Pathology (33)
- QZ Pathology (87)
- R Medicine (4706)
  - Environmental Health (1)
  - R Medicine (General) (2352)
  - RC Internal medicine (1046)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (4)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1036)
  - RD Surgery (455)
  - RG Gynecology and obstetrics (122)
  - RK Dentistry (1)
  - RT Nursing (211)
  - RZ Other systems of medicine (550)
- T Technology (27)
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  - TD Environmental technology. Sanitary engineering (24)
  - TJ Mechanical engineering and machinery (2)
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  - U Military Science (General) (1)
- W General Medicine , Health professions (25)
- WA Public Health (459)
- WB Practice of Medicine (150)
- WC Communicable Diseases (32)
- WD Nutrition Disease and metabolic diseases (12)
- WE Musculoskeletal system (11)
- WF Respiratory System (15)
- WG Cardiovascular System (58)
- WH Hemic and Lymphatic System (35)
- WI Digestive System (3)
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- WK Endocrine System (43)
- WL Nervous system (29)
- WM Psychiatry (20)
- WN Radiology . Diagnostic Imaging (39)
- WO Surgery (7)
- WP Gynecology (43)
- WQ Obstetrics (15)
- WR Dermatology (27)
- WS Pediatrics (153)
- WT Geriatrics . Chronic Diseases (12)
- WU Dentistry. Oral surgery (157)
- WV Otolaryngology (2)
- WW Ophthalmology (28)
- WX Hospital and other health Facilities (4)
- WY Nursing (102)
- WZ History of Medicine (1)
- Z Bibliography. Library Science. Information Resources (252)
  - Z665 Library Science. Information Science (10)
  - ZA Information resources (242)
    - ZA4450 Databases (1)