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Library of Congress Classification System

The general book stacks (call letters A-M on the Second Floor South and call letters N-Z on the Third Floor South), the Reference Collection, the Humboldt County Collection, and the HSU Archives Collection all use the Library of Congress Classification System for organizing materials by subject. For a more detailed classification breakdown see the Library of Congress Classification Outline from the Library of Congress.

Library of Congress Classification
A - General Works B - Philosophy, Psychology, Religion C - Auxiliary Sciences of History D - History (General) and History of Europe E-F - History - America and United States G - Geography, Anthropology, Recreation H - Social Sciences J - Political Science K - Law L - Education	M - Music and Books on Music N - Fine Arts P - Language and Literature Q - Science R - Medicine S - Agriculture T - Technology U - Military Science V - Naval Science Z - Bibliography, Library Science, Information Resources (General)

A - General Works: AC - Collections, Series, Collected works; AE - Encyclopedias (general); AG - Dictionaries and other general reference works; AI - Indexes (general); AM - Museums, Collectors and collecting; AN - Newspapers; AP - Periodicals (general); AS - Academies and learned societies; AY - Yearbooks, Almanacs, Directories; AZ - History of scholarship and learning
B - Philosphy, Psychology, Religion: B - Philosophy (General); BC - Logic; BD - Speculative philosophy; BF - Psychology; BH - Aesthetics; BJ - Ethics; BL - Religions, Mythology, Rationalism; BM - Judaism; BP - Islam, Bahaism, Theosophy, etc.; BQ - Buddhism; BR - Christianity; BS - The Bible; BT - Doctrinal Theology; BV - Practical Theology; BX - Christian Denominations
C - Auxiliary Sciences of History: 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 History of Europe: D - History (General); DA - Great Britain; DAW - Central Europe; DB - Austria, Liechtenstein, Hungary, Czechoslovakia; DC - France, Andorra, Monaco; DD - Germany; DE - Greco-Roman World; DF - Greece; DG - Italy, Malta; 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; DS - Asia; DT - Africa; DU - Oceania (South Seas); DX - Gypsies
E - History - America (General) & United States (General): E 11-29 - America (General); E 31-49 - North America (General); E 51-99 - Indians of North America; E 101-135 - Discovery of America; E 151-184 - United States: General History; E 185 - Afro-Americans in the United States; E 186-199 - Colonial History, 1607-1775; E 201-298 - The Revolution, 1775-1783; E 300-453 - Revolution to the Civil War, 1775/1783-1861; E 456-655 - Civil War Period, 1861-1865; E 660-664 - Late Nineteenth Century, 1865-1900; E 740-837 - Twentieth Century; World War I: see D 501-680; World War II: see D 731-838; E 838-889 - Late Twentieth Century, 1961-
F - History - United States (Local) & America (except the U.S.): F 1-975 - United States (Individual States); F 1001-1145 - British America (Canada); F 1170 - French America; F 1201-3799 - Latin America, Spanish America
G - Geography; Anthropology; Folklore; Recreation: G - Geography (General), Atlases, Maps; 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: H - Social Sciences (General); HA - Statistics; HB - Economic Theory, Demography; HC - Economic History and Conditions; HD - Industries, Land Use, Labor; HE - Transportation and Communication; 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, Criminology; HX - Socialism, Communism, Anarchism
J - Political Science: J - General Legislative and Executive Papers; JA - Political Science (General); JC - Political Theory; JF - Political Institutions and Public Administration - General; JK - Political Institutions and Public Administration - United States; JL - Political Institutions and Public Administration - Canada, West Indies, Mexico, Central and South America; JN - Political Institutions and Public Administration - Europe; JQ - Political Institutions and Public Administration - Asia, Arab Countries, Islamic Countries, Africa, Atlantic Ocean Islands, Australia, New Zealand, Pacific Ocean Islands; JS - Local Government, Municipal Government; JV - Colonies and Colonization, Emigration and Immigration, International Migration; JZ - International Relations
K - Law: K - Law in General, Comparative and Uniform Law, Jurispudence; KB - Religious Law; KD - United Kingdom, Ireland; KE - Canada; KF - United States; KG - Latin America (Mexico and Central America), West Indies, Caribbean Areas; KH - South America; KJ-KK - Europe; KL-KW - Asia and Eurasia, Africa, Pacific Area, and Antarctica; KZ - Law of Nations
L - Education: L - Education (General); 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, Indian Ocean Islands, Australia, New Zealand, Pacific Islands; LH - College and School Magazines and Papers; LJ - Student Fraternities and Societies, United States; LT - Textbooks
M - Music: M - Music; ML - Literature on Music; MT - Musical Instruction and Study
N - Fine Arts: N - Visual Arts (General); NA - Architecture; NB - Sculpture; NC - Drawing, Design, Illustration; ND - Painting; NE - Print Media; NK - Decorative Arts; NX - Arts in General
P - Language and Literature: P - Philology and Linguistics; PA - Greek Language and Literature, Latin Language and Literature; PB - Modern Languages, Celtic Languages; PC - Romanic Languages; PD - Germanic Languages, Scandinavian Languages; PE - English Language; PF - West Germanic Languages; PG - Slavic Languages, Baltic Languages, Albanian Language; PH - Uralic Languages, Basque Language; PJ - Oriental Languages and Literatures; 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 Literature, Italian Literature, Spanish Literature, Portuguese Literature; PR - English Literature; PS - American Literature; PT - German Literature, Dutch and Scandinavian Literature; PZ - Fiction and Juvenile Belles Lettres
Q - Science: Q - Science (General); QA - Mathematics; QB - Astronomy; QC - Physics; QD - Chemistry; QE - Geology; QH - Natural History, Biology; QK - Botany; QL - Zoology; QM - Human Anatomy; QP - Physiology; QR - Microbiology
R - Medicine: R - Medicine (General); RA - Public Aspects of Medicine; RB - Pathology; RC - Internal Medicine; RD - Surgery; RE - Opthalmology; 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: S - Agriculture (General); S 900-999 - Conservation of Natural Resources; SB - Plant Culture; SD - Forestry; SF - Animal Culture; SH - Aquaculture, Fisheries, Angling; SK - Hunting Sports
T - Technology: T - Technology (General); 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
U - Military Science: U - Military Science (General); UA - Armies: Organization, Distribution, Military Situation; UB - Military Administration; UC - Maintenance and Transportation; UD - Infantry; UE - Cavalry, Armor; UF - Artillery; UG - Military Engineering, Air Forces; UH - Other Services
V - Naval Science: V - Naval Science (General); 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: Z - Books (General), Writing, Paleography, Book Industries and Trade, Libraries, Bibliography; Z 4-8 - History of Books & Bookmaking; Z 40-115 - Writing; Z 116-549 - Book Industries and Trade; Z 551-656 - Copyright; Z 657-659 - Freedom of the Press, Censorship; Z 662-997 - Libraries and Library Science; Z 998-1000 - Booksellers' Catalogs, Book Prices; Z 1001-1107 - General Bibliography; Z 1201-4980 - National Bibliography; Z 5051-7999 - Subject Bibliography; Z 8001-8999 - Personal Bibliography; ZA - Information Resources (General)