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Library of Congress Subject Areas (10912)
- A General Works (31)
  - AC Collections. Series. Collected works (22)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (7)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (18)
  - B Philosophy (General) (6)
  - BF Psychology (6)
  - BL Religion (9)
  - BP Islam. Bahaism. Theosophy, etc (4)
- D History General and Old World (1)
  - D History (General) (1)
    - D051 Ancient History (1)
- G Geography. Anthropology. Recreation (9)
  - GE Environmental Sciences (4)
  - GF Human ecology. Anthropogeography (5)
  - GN Anthropology (1)
- H Social Sciences (91)
  - H Social Sciences (General) (56)
  - HA Statistics (4)
  - HB Economic Theory (1)
  - HC Economic History and Conditions (4)
  - HE Transportation and Communications (8)
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    - HF5601 Accounting (1)
  - HM Sociology (3)
  - HN Social history and conditions. Social problems. Social reform (8)
  - HQ The family. Marriage. Woman (24)
  - HT Communities. Classes. Races (6)
  - HV Social pathology. Social and public welfare (10)
- L Education (166)
  - L Education (General) (139)
  - LA History of education (1)
  - LB Theory and practice of education (41)
    - LB1501 Primary Education (2)
    - LB1603 Secondary Education. High schools (2)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (5)
    - LC5201 Education extension. Adult education. Continuing education (1)
  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (1)
- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (1)
  - NC Drawing Design Illustration (2)
  - ND Painting (1)
  - NK Decorative arts Applied arts Decoration and ornament (1)
  - NX Arts in general (1)
- P Language and Literature (3)
  - P Philology. Linguistics (3)
- Q Science (269)
  - Q Science (General) (141)
  - QC Physics (3)
  - QD Chemistry (77)
  - QE Geology (2)
  - QH Natural history (3)
    - QH301 Biology (1)
    - QH426 Genetics (1)
  - QK Botany (2)
  - QL Zoology (7)
  - QM Human anatomy (7)
  - QP Physiology (9)
  - QR Microbiology (71)
    - QR180 Immunology (1)
    - QR355 Virology (11)
- R Medicine (8702)
  - R Medicine (General) (935)
  - RA Public aspects of medicine (1149)
    - RA0421 Public health. Hygiene. Preventive Medicine (1068)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (98)
  - RC Internal medicine (16)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (10)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
  - RD Surgery (12)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (1856)
  - RJ Pediatrics (124)
    - RJ101 Child Health. Child health services (63)
  - RK Dentistry (711)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (19)
  - RS Pharmacy and materia medica (10)
  - RT Nursing (3594)
  - RV Botanic, Thomsonian, and eclectic medicine (8)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (722)
- S Agriculture (3)
  - S Agriculture (General) (1)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (1714)
  - T Technology (General) (59)
    - T201 Patents. Trademarks (3)
  - TA Engineering (General). Civil engineering (General) (4)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (1637)
  - TE Highway engineering. Roads and pavements (4)
  - TJ Mechanical engineering and machinery (1)
  - TP Chemical technology (64)
  - TS Manufactures (1)
  - TT Handicrafts Arts and crafts (1)
- Z Bibliography. Library Science. Information Resources (191)
  - Z004 Books. Writing. Paleography (10)
  - Z665 Library Science. Information Science (23)
  - Z719 Libraries (General) (9)
  - ZA Information resources (165)
    - ZA4050 Electronic information resources (155)
    - ZA4450 Databases (4)