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| A - General Works |  |
| AC - Collections | |
| AE - Encyclopedias | |
| AG - Dictionaries | |
| AI - Indexes | |
| AM - Museums | |
| AN - Newspapers | |
| AP - Periodicals | |
| AS - Academies and learned societies | |
| AY - Yearbooks. Almanacs. Directories | |
| AZ - History of scholarship. The humanities | |
| B - Philosophy, Psychology, and Religion | |
| BC - Logic | |
| BD - Speculative philosophy | |
| BF - Psychology | |
| BH - Aesthetics | |
| BJ - Ethics | |
| BL - Religion. Mythology. Rationism | |
| BM - Judaism | |
| BP - Islam. Bahaism. Theosophy, etc. | |
| BQ - Buddhism | |
| BR - Christianity | |
| BS - The Bible | |
| BT - Practical theology | |
| BV - Practical theology | |
| BX - Christian denominations | |
| C - History: Auxiliary sciences | |
| CB - History of civilization | |
| CC - Archaeology | |
| CD - Diplomatics. Archives. Seals | |
| CE - Technical chronology. Calendar | |
| CJ - Numismatics | |
| CN - Inscriptions. Epigraphy | |
| CR - Heraldry | |
| CS - Genealogy | |
| CT - Biography (General) | |
| D - History: General, and Regions Outside the Americas | |
| DA - Great Britain | |
| DAW - Central Europe | |
| DB - Austria. Hungary. Czechoslovakia | |
| DC - France | |
| DD - Germany | |
| DE - The Greco-Roman World | |
| DF - Greece | |
| DG - Italy | |
| DH - Low Countries. Benelux Countries | |
| DJ - Netherlands (Holland) | |
| DJK - Eastern Europe (General) | |
| DK - Russia. Soviet Union. Former Soviet Republics. Poland | |
| DL - Northern Europe. Scandinavia | |
| DP - Spain. Portugal | |
| DQ - Switzerland | |
| DR - Balkan Peninsula. Turkey | |
| DS - Asia | |
| DT - Africa | |
| DU - Oceania (South Seas) | |
| DX - Gypsies | |
| E - History: United States (General) | |
| F - History: United States (Regional), and the Americas | |
| G - Geography, Anthropology, Folklore, Recreation | |
| GA - Mathematical geography. Cartography | |
| GB - Physical geography | |
| GC - Oceanography | |
| GE - Environmental sciences | |
| GF - Human ecology. Anthropogeography | |
| GN - Anthropology | |
| GR - Folklore | |
| GT - Manners and customs (General) | |
| GV - Recreation Leisure | |
| H - Social Sciences | |
| HA - Statistics | |
| HB - Economic theory. Demography | |
| HC - Economic history and conditions | |
| HD - Industries. Land use. Labor | |
| HE - Transportation and communications | |
| HF - Commerce | |
| HG - Finance | |
| HJ - Public finance | |
| HM - Sociology (General) | |
| HN - Social history and conditions. Social problems. Social reform | |
| HQ - The family. Marriage. Women | |
| HS - Societies: secret, benevolent, etc. | |
| HT - Communities. Classes. Races | |
| HV - Social pathology. Social and public welfare | |
| HX - Socialism. Communism. Anarchism | |
| J - Political Science | |
| JA - Political science (General) | |
| JC - Political theory | |
| JE - Juvenile | |
| JF - Political institutions and public administration — General | |
| JK - Political institutions and public administration — United States | |
| JL - Political institutions and public administration — Canada. Latin America | |
| JN - Political institutions and public administration — Europe | |
| JQ - Political institutions and public administration — Asia. Africa. Australia. Pacific area | |
| JS - Local government. Municipal government | |
| JV - Colonies and colonization. Emigration and immigration. International migration | |
| JZ - International relations | |
| K - Law | |
| KBR - Canon Law and Law of the Roman Catholic Church;. The Holy See | |
| KD - United Kingdom and Ireland | |
| KDZ - America. North America | |
| KE - Canada | |
| KF - United States | |
| KG - Latin America. Central America. West Indies | |
| KH - South America | |
| KJ - Europe | |
| KK - Europe | |
| KL - Asia. Africa. Pacific Area. Antarctica | |
| KW - Asia. Africa. Pacific Area. Antarctica | |
| KZ - Law of nations | |
| L - Education | |
| LA - History of Education | |
| LB - Theory and Practice of Education | |
| LC - Special Aspects of Education | |
| LD - Individual institutions - United States | |
| LE - Individual institutions - America (except United States) | |
| LF - Individual institutions - Europe | |
| LG - Individual institutions — Asia. Africa. Oceania | |
| LH - College and school magazines and papers | |
| LJ - Student fraternities and societies, United States | |
| LT - Textbooks | |
| M - Music | |
| ML - Literature on music | |
| MO - Missouri Government Documents | |
| MT - Musical instruction and study | |
| N - Fine Arts | |
| NA - Architecture | |
| NB - Sculpture | |
| NC - Drawing. Design. Illustration | |
| ND - Painting | |
| NE - Print media | |
| NK - Decorative arts. Applied arts | |
| NX - Arts in general | |
| P - Language and literature | |
| PA - Greek and Latin languages and literatures | |
| PB - Modern languages (General). Celtic languages | |
| PC - Romance languages | |
| PD - Germanic languages (General). Scandinavian languages | |
| PE - English language | |
| PF - West Germanic languages | |
| PG - Slavic, Baltic, Albanian languages and literature | |
| PH - Uralic, Basque languages and literatures | |
| PJ - Oriental philology and literature (General). Semitic languages and literature | |
| PK - Indo-Iranian languages and literatures | |
| PL - Languages and literatures of Eastern Asia, Africa, Oceania | |
| PM - Hyperborean, Indian, and Artificial languages | |
| PN - Literature (General) | |
| PQ - French, Italian, Spanish and Portuguese literatures | |
| PR - English literature | |
| PS - American literature | |
| PT - Germanic literatures | |
| PZ - Fiction and Juvenile belles lettres | |
| Q - Science | |
| QA - Mathematics, Computer Science, Statistics | |
| QB - Astronomy | |
| QC - Physics | |
| QD - Chemistry | |
| QE - Geology | |
| QH - Natural History. Biology | |
| QK - Botany | |
| QL - Zoology | |
| QM - Human anatomy | |
| QP - Microbiology | |
| R - Medicine | |
| RA - Public aspects of medicine | |
| RB - Pathology | |
| RC - Internal medicine | |
| RD - Surgery | |
| RE - Ophthalmology | |
| REF - Reference books | |
| RF - Otorhinolaryngology | |
| RG - Gynecology and obstetrics | |
| RJ - Pediatrics | |
| RK - Dentistry | |
| RL - Dermatology | |
| RM - Therapeutics. Pharmacology | |
| RS - Pharmacy and materia medica | |
| RT - Nursing | |
| RV - Botanic, Thomsonian, and eclectic medicine | |
| RX - Homeopathy | |
| RZ - Other systems of medicine | |
| S - Agriculture | |
| SB - Plant culture | |
| SD - Forestry | |
| SF - Animal culture | |
| SH - Aquaculture. Fisheries. Angling | |
| SK - Hunting sports | |
| T - Technology | |
| TA - Engineering (General). Civil engineering | |
| TC - Hydraulic engineering. Ocean engineering | |
| TD - Environmental technology. Sanitary engineering | |
| TE - Highway engineering. Roads and pavements | |
| TF - Railroad engineering and operation | |
| TG - Bridge engineering | |
| TH - Building construction | |
| TJ - Mechanical engineering and machinery | |
| TK - Electrical engineering. Electronics. Nuclear engineering | |
| TL - Motor vehicles. Aeronautics. Astronautics | |
| TN - Mining engineering. Metallurgy | |
| TP - Chemical technology | |
| TR - Photography | |
| TS - Manufactures | |
| TT - Handicrafts. Arts and crafts | |
| TX - Home economics. Hospitality industry | |
| U - Military Science | |
| UA - Armies: Organization, distribution, military situation | |
| UB - Military administration | |
| UC - Maintenance and transportation | |
| UD - Infantry | |
| UE - Cavalry. Armor | |
| UF - Artillery | |
| UG - Military engineering. Air Force | |
| UH - Other services | |
| V - Naval Science | |
| VA - Navies: Organization, distribution, naval situation | |
| VB - Naval administration | |
| VC - Naval maintenance | |
| VD - Naval seamen | |
| VE - Marines | |
| VF - Naval ordnance | |
| VG - Minor services of navies | |
| VK - Navigation. Merchant marine | |
| VM - Naval architecture. Shipbuilding. Marine engineering | |
| Z - Bibliography and Library Science | |
| ZA - Information resources (General) | |
