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Library of Congress Subject Areas (11578)
- A General Works (11)
  - AM Museums (11)
- B Philosophy. Psychology. Religion (532)
  - B Philosophy (General) (51)
  - BC Logic (4)
  - BD Speculative philosophy (17)
  - BF Psychology (311)
  - BH Aesthetics (4)
  - BJ Ethics (12)
  - BL Religion (13)
  - BM Judaism (2)
  - BP Islam. Bahaism. Theosophy, etc. (11)
  - BR Christianity (23)
  - BS The Bible (41)
  - BT Doctrinal theology (26)
  - BV Practical theology (18)
  - BX Christian denominations (31)
- C Auxiliary sciences of history (50)
  - CB History of civilization (2)
  - CC Archaeology (36)
  - CJ Numismatics (6)
  - CR Heraldry (3)
  - CT Biography (3)
- D History - General and Old World (300)
  - D History (General) (11)
    - D111 Medieval history (1)
    - D731 World War II (3)
  - DA Great Britain (126)
  - DB Austria. Liechtenstein. Hungary. Czechoslovakia (4)
  - DC France (7)
  - DD Germany (5)
  - DE The Mediterranean region. The Greco-Roman world (1)
  - DF Greece (17)
  - DG Italy (22)
  - DJK Eastern Europe (1)
  - DK Russia. Soviet Union. Former Soviet Republics (14)
  - DL Northern Europe. Scandinavia (4)
  - DP Spain. Portugal (14)
  - DQ Switzerland (1)
  - DR Balkan Peninsula (9)
  - DS Asia (63)
  - DT Africa (16)
  - DU Oceania (South Seas) (2)
- E History - America (38)
  - E11 America (General) (2)
  - E151 United States (General) (36)
- F United States local history. History of Canada and Latin America (31)
  - F1 United States local history (8)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (21)
- G Geography. Anthropology. Recreation (250)
  - G Geography (General) (76)
  - GA Mathematical geography. Cartography (9)
  - GB Physical geography (50)
  - GC Oceanography (12)
  - GE Environmental Sciences (26)
  - GF Human ecology. Anthropogeography (15)
  - GN Anthropology (21)
  - GR Folklore (3)
  - GT Manners and customs (14)
  - GV Recreation. Leisure (28)
- H Social sciences (1102)
  - H Social sciences (General) (15)
  - HA Statistics (2)
  - HB Economic theory (71)
  - HC Economic history and conditions (69)
  - HD Industries. Land use. Labor (327)
  - HE Transportation and communications (21)
  - HF Commerce (136)
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  - HJ Public finance (11)
  - HM Sociology (82)
  - HN Social history and conditions. Social problems. Social reform (18)
  - HQ The family. Marriage. Woman (79)
  - HT Communities. Classes. Races (47)
  - HV Social pathology. Social and public welfare (124)
  - HX Socialism. Communism. Anarchism (7)
- J Political science (165)
  - JA Political science (General) (8)
  - JC Political theory (25)
  - JF Political institutions (General) (12)
  - JK Political institutions (United States) (4)
  - JL Political institutions (Canada, Latin America, etc.) (5)
  - JN Political institutions (Europe) (33)
    - JN101 Great Britain (18)
  - JQ Political institutions (Asia, Africa, Australasia, etc.) (25)
  - JS Local government. Municipal government (8)
  - JV Colonies and colonization. Emigration and immigration. International migration (11)
  - JZ International relations (42)
- K Law (170)
  - K Law (General) (75)
  - KB Religious law (5)
  - KD England and Wales (32)
  - KF United States (3)
  - KG South America (2)
  - KJ Europe (24)
  - KM Asia (6)
  - KQ Africa (6)
  - KZ Law of nations. Law of the sea. Space law (28)
- L Education (552)
  - L Education (General) (17)
  - LA History of education (32)
  - LB Theory and practice of education (401)
    - LB1024 Teaching (44)
    - LB1050 Educational psychology (81)
    - LB1101 Child study. Preschool education (9)
    - LB1501 Primary education (35)
    - LB1603 Secondary education. High schools (43)
    - LB1705 Education of teachers (36)
    - LB2300 Higher education (76)
  - LC Special aspects of education (133)
    - LC 65 Social aspects of education (24)
    - LC 251 Moral and religious education (5)
    - LC1 Forms of education, including self, home, alternative, private (3)
    - LC1001 Types of education, including humanistic, vocational, professional (24)
    - LC1390 Education of special classes of persons (31)
    - LC5201 Education extension. Adult education. Continuing education (19)
  - LD-LG Individual institutions (2)
- M Music and Literature on music (86)
  - M Music (19)
  - ML Literature of music (66)
  - MT Musical instruction and study (6)
- N Fine Arts (190)
  - N Visual arts (General). For photography, see TR (25)
  - NA Architecture (140)
  - NB Sculpture (4)
  - NC Drawing. Design. Illustration (5)
  - ND Painting (7)
  - NE Print media (1)
  - NK Decorative arts. Applied arts. Decoration and ornament (8)
  - NX Arts in general (4)
- P Language and literature (590)
  - P Philology. Linguistics (146)
  - PA Classical philology (26)
  - PB Modern European languages. Celtic languages (3)
  - PC Romance languages (9)
  - PD Germanic languages (6)
  - PE English (73)
  - PF West Germanic (3)
  - PG Slavic, Baltic, Albanian languages and literature (18)
  - PJ Oriental languages and literatures (3)
  - PK Indo-Iranian (1)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (9)
  - PN Literature (General) (148)
    - PN 80 Criticism (21)
    - PN 441 Literary history (5)
    - PN1990 Broadcasting (18)
    - PN1993 Motion pictures (49)
    - PN2000 Dramatic representation. The Theater (14)
  - PQ Romance literatures (38)
    - PQ1 French literature (19)
    - PQ4001 Italian literature (1)
    - PQ6001 Spanish literature (10)
    - PQ9000 Portuguese literature (7)
  - PR English literature (103)
  - PS American literature (52)
  - PT Germanic literature (17)
  - PZ Children's literature (1)
- Q Science (3464)
  - Q Science (General) (55)
  - QA Mathematics (682)
    - QA 75 Electronic computers. Computer science (317)
    - QA150 Algebra (48)
    - QA273 Probabilities (42)
    - QA276 Mathematical statistics (44)
    - QA299 Analysis (120)
    - QA440 Geometry (16)
    - QA611 Topology (22)
    - QA801 Analytic mechanics (24)
  - QB Astronomy (91)
  - QC Physics (470)
    - QC120 Mechanics (8)
    - QC170 Atomic physics. Constitution and properties of matter (181)
    - QC20 Mathematical physics (2)
    - QC220 Acoustics. Sound (2)
    - QC251 Heat (4)
    - QC350 Optics. Light, including spectroscopy (52)
    - QC474 Radiation physics (General) (2)
    - QC501 Electricity and magnetism (139)
    - QC770 Nuclear and particle physics. Atomic energy. Radioactivity (42)
    - QC801 Geophysics. Cosmic physics (3)
    - QC811 Geomagnetism. Meteorology. Climatology (26)
  - QD Chemistry (558)
    - QD 71 Analytical chemistry (35)
    - QD146 Inorganic chemistry (49)
    - QD241 Organic chemistry (265)
      - QD415 Biochemistry (52)
    - QD450 Physical and theoretical chemistry (159)
    - QD901 Crystallography (12)
  - QE Geology (24)
  - QH Natural history. Biology (376)
    - QH 75 Nature conservation. Landscape protection (8)
    - QH 84 Geophysical distribution. Biogeography (4)
    - QH201 Microscopy (28)
    - QH301 Biology (General) (37)
    - QH359 Evolution (6)
    - QH426 Genetics (126)
    - QH471 Reproduction. Life (9)
    - QH540 Ecology (43)
    - QH573 Cytology (96)
  - QK Botany (224)
    - QK Botany (General), including geographical distribution (7)
    - QK457 Spermatophyta. Phanerogams (29)
    - QK504 Cryprogams (26)
    - QK640 Plant anatomy (46)
    - QK710 Plant physiology (71)
    - QK900 Plant ecology (20)
  - QL Zoology (173)
    - QL1 Zoology (General), including geographical distribution (6)
    - QL360 Invertebrates (61)
    - QL605 Chordates. Vertebrates (39)
    - QL750 Animal behaviour (8)
    - QL801 Anatomy (8)
    - QL951 Embryology (15)
  - QM Human anatomy (10)
  - QP Physiology (772)
    - QP1 Physiology (General) including influence of the environment (72)
    - QP351 Neurophysiology and neuropsychology (139)
    - QP501 Animal biochemistry (446)
  - QR Microbiology (404)
    - QR 75 Bacteria. Cyanobacteria (152)
    - QR100 Microbial ecology (42)
    - QR171 Microorganisms in the animal body (19)
    - QR180 Immunology (91)
    - QR355 Virology (25)
- QS-QZ Preclinical sciences (NLM Classification) (289)
  - QS Human anatomy (11)
  - QT Physiology (21)
  - QU Biochemistry (109)
  - QV Pharmacology (34)
  - QW Microbiology. Immunology (65)
    - QW1 Microbiology (15)
    - QW501 Immunology (13)
  - QX Parasitology (2)
  - QY Clinicial pathology (1)
  - QZ Pathology (48)
- R Medicine (1089)
  - R Medicine (General) (157)
    - R855 Medical technology. Biomedical engineering. Electronics (112)
  - RA Public aspects of medicine (99)
    - RA 421 Public health. Hygiene. Preventive Medicine (49)
    - RA1001 Forensic medicine. Medical jurisprudence. Legal medicine (3)
  - RB Pathology (32)
  - RC Internal medicine (384)
    - RC 254 Neoplasms. Tumors. Oncology (including Cancer) (88)
    - RC 321 Neuroscience. Biological psychiatry. Neuropsychiatry (136)
    - RC1200 Sports medicine (1)
  - RD Surgery (31)
  - RE Ophthalmology (9)
  - RF Otorhinolaryngology (5)
  - RG Gynecology and obstetrics (25)
  - RJ Pediatrics (30)
  - RK Dentistry (2)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (184)
  - RS Pharmacy and materia medica (215)
  - RT Nursing (19)
- S Agriculture (600)
  - S Agriculture (General) (78)
  - SB Plant culture (266)
  - SD Forestry (18)
  - SF Animal culture (243)
  - SH Aquaculture. Fisheries. Angling (10)
  - SK Hunting sports (1)
- T Technology (2541)
  - T Technology (General) (58)
  - TA Engineering (General). Civil engineering (General) (577)
    - TA 357 Fluid mechanics (48)
    - TA 365 Acoustics in engineering. Acoustical engineering (8)
    - TA 501 Surveying (19)
    - TA 630 Structural engineering (General) (29)
    - TA 703 Engineering geology. Rock and soil mechanics (38)
    - TA1501 Applied optics. Phonics (49)
  - TC Hydraulic engineering. Ocean engineering (35)
  - TD Environmental technology. Sanitary engineering (138)
  - TE Highway engineering. Roads and pavements (84)
  - TF Railroad engineering and operation (28)
  - TG Bridge engineering (10)
  - TH Building construction (153)
    - TH 845 Architectural engineering (11)
    - TH6014 Environmental and sanitary engineering of buildings (13)
    - TH7005 Heating and ventilation. Air conditioning (60)
    - TH7700 Illumination. Lighting (7)
  - TJ Mechanical engineering and machinery (240)
    - TJ170 Mechanics applied to machinery. Dynamics (8)
    - TJ212 Control engineering systems. Automatic machinery (13)
    - TJ255 Heat engines. Turbines (7)
    - TJ751 Internal combustion engines. Diesel engines (24)
    - TJ807 Renewable energy sources (41)
  - TK Electrical engineering. Electronics Nuclear engineering (446)
    - TK3001 Distribution or transmission of electric power (29)
    - TK5101 Telecommunication (42)
    - TK7800 Electronics (163)
      - TK7885 Computer engineering. Computer hardware (6)
      - TK8300 Photoelectronic devices (15)
  - TL Motor vehicles. Aeronautics. Astronautics (142)
  - TN Mining engineering. Metallurgy (81)
  - TP Chemical technology (435)
    - TP 155 Chemical engineering (10)
    - TP 368 Food processing and manufacture (75)
    - TP 785 Clay industries. Ceramics. Glass (8)
    - TP1080 Polymers and polymer manufacture (28)
  - TR Photography (16)
  - TS Manufactures (148)
  - TT Handicrafts. Arts and crafts (2)
  - TX Home economics (66)
- U Military science (16)
  - U Military science (General) (16)
- V Naval science (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- W Medicine and related subjects (NLM Classification) (1306)
  - W Health professions (29)
  - WA Public health (71)
  - WB Practice of medicine (32)
  - WC Communicable diseases (34)
  - WD Disorders of systemic, metabolic or environmental origin (19)
  - WE Muscoskeletal system (106)
  - WF Respiratory system (75)
  - WG Cardiocascular system (45)
  - WH Hemic and lymphatic system (19)
  - WI Digestive system (101)
  - WJ Urogenital system (28)
  - WK Endocrine system (28)
  - WL Nervous system (149)
  - WM Psychiatry (268)
  - WN Radiology. Diagnostic imaging (20)
  - WO Surgery (14)
  - WP Gynecology (69)
  - WQ Obstetrics (36)
  - WR Dermatology (8)
  - WS Pediatrics (55)
  - WT Geriatrics. Chronic disease (35)
  - WU Dentistry. Oral surgery (2)
  - WV Otolaryngology (35)
  - WW Ophthalmology (16)
  - WX Hospitals and other health facilities (13)
  - WY Nursing (28)
- Z Bibliography. Library science. Information resources (14)
  - Z Bibliography. Library science. Information resources (14)

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