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Library of Congress Subject Areas (23404)
- A General Works (133)
  - AC Collections. Series. Collected works (41)
  - AI Indexes (General) (41)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (51)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (59)
  - B Philosophy (General) (5)
  - BC Logic (2)
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  - BL Religion (8)
  - BP Islam. Bahaism. Theosophy, etc (20)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (3)
  - CC Archaeology (1)
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    - CD921 Archives (1)
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- D History General and Old World (11)
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    - D051 Ancient History (3)
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- E History America (2)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (75)
  - G Geography (General) (12)
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  - GF Human ecology. Anthropogeography (2)
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- H Social Sciences (7909)
  - H Social Sciences (General) (1788)
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  - HB Economic Theory (613)
  - HC Economics (2062)
  - HD Industries. Land use. Labor (1087)
    - HD1401 Agriculture-Economic aspects (116)
    - HD28 Management. Industrial Management (400)
    - HD30.213 Decision Support Systems (22)
    - HD30.27 Business Forecasting (40)
    - HD30.28 Strategic Planning (101)
    - HD30.3 Communication in Organizations (50)
    - HD38.5 Supply Chain Management (105)
    - HD59-59.6 Public relations. Industrial publicity (44)
    - HD61 Risk Management (51)
    - HD62.15 Total Quality Management (59)
    - HD9000 Agricultural Industries (110)
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  - HE Transportation and Communications (82)
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    - HG1501-3550 Banking (44)
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    - HG4001-4285 Finance management. Business finance. Corporation finance (436)
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  - HN Social history and conditions. Social problems. Social reform (317)
  - HQ The family. Marriage. Woman (83)
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  - HV Social pathology. Social and public welfare (71)
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- J Political Science (1211)
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    - JQ224 Public policy and administration (60)
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- L Education (953)
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    - LC5201 Education extension. Adult education. Continuing education (4)
  - LD Individual institutions (United States) (3)
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  - LT Textbooks (4)
- M Music and Books on Music (23)
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- N Fine Arts (1352)
  - N Visual arts (563)
    - N400-3990 Art museums, galleries, etc. (19)
    - N61-72 Theory. Philosophy. Aesthetics of the visual arts (66)
    - N81-390 Study and teaching. Research (66)
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  - NA Architecture (526)
    - NA2695-2793 Architectural drawing and design (379)
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  - NE Print media (166)
  - NK Decorative arts Applied arts Decoration and ornament (51)
  - NX Arts in general (178)
- P Language and Literature (486)
  - P Philology. Linguistics (459)
    - P302-302.87 Discourse analysis (8)
    - P87 Communication. Mass Media (366)
    - P94.7 Interpersonal communication (37)
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    - P99 Semiotics. Signs and Symbols (39)
    - P99.5 Non Verbal communication (11)
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- Q Science (1923)
  - Q Science (General) (564)
  - QA Mathematics (1080)
    - QA76.87 Neural computers (77)
    - QA75 Electronic computers. Computer science (306)
    - QA76 Computer software (261)
    - QA76.6 Computer Programming (570)
    - QA76.625 Internet Programming (166)
    - QA76.76.E95 Expert Systems (21)
    - QA76.9 .A25 Computer Security (19)
  - QB Astronomy (1)
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  - QD Chemistry (377)
  - QE Geology (8)
  - QH Natural history (9)
    - QH301 Biology (7)
  - QK Botany (23)
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  - QR Microbiology (46)
    - QR355 Virology (1)
- R Medicine (36)
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  - RA Public aspects of medicine (12)
    - RA0421 Public health. Hygiene. Preventive Medicine (11)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RC Internal medicine (1)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
  - RE Ophthalmology (1)
  - RG Gynecology and obstetrics (1)
  - RJ Pediatrics (1)
    - RJ101 Child Health. Child health services (1)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (2)
- S Agriculture (1948)
  - S Agriculture (General) (1666)
    - S590-599.9 Soils. Soil science (228)
    - S631-667 Fertilizers and Improvement of the soil (187)
  - SB Plant culture (354)
    - SB599-990.5 Pests and Diseases (100)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (174)
  - SD Forestry (42)
  - SF Animal culture (28)
  - SH Aquaculture. Fisheries. Angling (33)
  - SK Hunting sports (2)
- T Technology (7576)
  - T Technology (General) (2758)
    - T55.4-60.8 Industrial engineering. Management engineering (708)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (151)
    - T58.6-58.62 Management Information Systems (747)
  - TA Engineering (General). Civil engineering (General) (802)
  - TC Hydraulic engineering. Ocean engineering (14)
  - TD Environmental technology. Sanitary engineering (1227)
  - TE Highway engineering. Roads and pavements (72)
  - TF Railroad engineering and operation (16)
  - TG Bridge engineering (14)
  - TH Building construction (98)
  - TJ Mechanical engineering and machinery (142)
  - TK Electrical engineering. Electronics Nuclear engineering (137)
    - TK5105 Computer Network (61)
    - TK5105.882 Internet (49)
    - TK5105.888 World Wild Web (52)
  - TL Motor vehicles. Aeronautics. Astronautics (8)
  - TN Mining engineering. Metallurgy (11)
  - TP Chemical technology (2508)
    - TP155 Chemical engineering (1917)
    - TP368 Food processing and manufacture (441)
    - TP500 Fermentation industries. Beverages. Alcohol (18)
  - TR Photography (24)
  - TS Manufactures (373)
    - TS 155-194 Production Management, Operations Management (266)
    - TS 180-TS180.8 Material Handling (30)
  - TT Handicrafts Arts and crafts (14)
  - TX Home economics (23)
- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (10)
  - V Naval Science (General) (3)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (97)
  - Z004 Books. Writing. Paleography (6)
  - Z665 Library Science. Information Science (48)
  - Z719 Libraries (General) (14)
  - ZA Information resources (40)
    - ZA4050 Electronic information resources (16)
    - ZA4450 Databases (21)