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Library of Congress Subject Areas (5872)
- A General Works (13)
  - AC Collections. Series. Collected works (10)
  - AS Academies and learned societies (General) (3)
- B Philosophy. Psychology. Religion (153)
  - B Philosophy (General) (69)
  - BF Psychology (84)
  - BV Practical Theology (1)
- C Auxiliary Sciences of History (1)
  - CE Technical chronology. Calendar (1)
- H Social Sciences (427)
  - H Social Sciences (General) (70)
  - HA Statistics (2)
  - HB Economic Theory (182)
  - HC Economic History and Conditions (56)
  - HD Industries. Land use. Labor (8)
    - HD28 Management. Industrial Management (5)
  - HE Transportation and Communications (3)
  - HF Commerce (2)
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  - HM Sociology (9)
  - HN Social history and conditions. Social problems. Social reform (34)
  - HQ The family. Marriage. Woman (2)
  - HT Communities. Classes. Races (3)
  - HV Social pathology. Social and public welfare (29)
  - HX Socialism. Communism. Anarchism (8)
- L Education (86)
  - L Education (General) (82)
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    - LB1501 Primary Education (1)
  - LD Individual institutions (United States) (1)
- Q Science (811)
  - Q Science (General) (244)
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  - QD Chemistry (262)
  - QH Natural history (3)
    - QH301 Biology (1)
  - QK Botany (154)
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  - QM Human anatomy (30)
  - QP Physiology (28)
  - QR Microbiology (132)
    - QR180 Immunology (17)
    - QR355 Virology (40)
- R Medicine (4592)
  - R Medicine (General) (1448)
  - RA Public aspects of medicine (193)
    - RA0421 Public health. Hygiene. Preventive Medicine (44)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (4)
  - RB Pathology (14)
  - RC Internal medicine (92)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (17)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
  - RD Surgery (4)
  - RE Ophthalmology (2)
  - RG Gynecology and obstetrics (4)
  - RK Dentistry (2)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (34)
  - RS Pharmacy and materia medica (2784)
  - RT Nursing (11)
  - RV Botanic, Thomsonian, and eclectic medicine (154)
  - RX Homeopathy (11)
  - RZ Other systems of medicine (15)
- S Agriculture (61)
  - S Agriculture (General) (59)
  - SB Plant culture (1)
  - SF Animal culture (5)
- T Technology (282)
  - T Technology (General) (50)
  - TA Engineering (General). Civil engineering (General) (42)
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  - TD Environmental technology. Sanitary engineering (5)
  - TH Building construction (5)
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  - TP Chemical technology (170)
  - TS Manufactures (15)
- Z Bibliography. Library Science. Information Resources (5)
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  - ZA Information resources (2)
    - ZA4050 Electronic information resources (2)