The book collection in this Library is arranged on the shelves according to the Library of Congress Classification System, which separates all knowledge into 21 classes, as outlined below. Each class is identified by a letter of the alphabet, subclasses by combinations of letters, and subtopics within classes and subclasses by a numerical notation. Having trouble understanding call numbers? Explore Understanding Library of Congress Call Numbers.
A: General Works
- AE-AG: Encyclopedias
- AI: Indexes
- AY: Almanacs
B: Philosophy - Psychology - Religion
- B-BJ: Philosophy, including
- BF: Psychology
- BJ: Ethics
- BL-BX: Religion
C: Auxiliary Sciences of History
- CB: History of Civilization & Culture
- CC: Archaeology
- CD: Archives
- CJ: Numismatics
- CR: Heraldry
- CS: Genealogy
- CT: Biography
D: History: General & Old World (including geography of individual countries)
- D: World History, including World Wars
- DA: Great Britain
- DB: Austria
- DC: France
- DD, etc.: Other individual countries
- DS: Orient, Vietnam
- DT: Africa
E: History--America
- E 1-143: America (General)
- E 51-99: Indians of North America
- E 151-857: United States (General)
- E 184.M5: Mexican American
- E 185: Afro-Americans
- E 201-298: Revolutionary War
- E 456-655: Civil War
- E 740-: Twentieth Century
F: History--America
- F 1-957: United States: States and Local
- F 806-820: Arizona History
- F 1001-1140: Canada
- F 1021, etc.: Other individual countries in North/South America
- F 1203-1409: Mexico
G: Geography - Anthropology - Folklore - Recreation
- G Geography (General)
- GB Physical Geography
- GC Oceanography
- GF Human Ecology
- GN Anthropology
- GR Folklore
- GT Manners and Customs, Holidays
- GV Recreation (Sports, Dance)
H: Social Sciences
- HA: Statistics
- HB-HJ: Economics
- HD-HF: Business
- HM-HX: Sociology
- HQ: Family, Marriage, Sexual Life, Feminism
- HV: Social/Public Welfare, Alcoholism, Drug Abuse, Criminology
J: Political Science
- JA-JC: Political Science
- JF-JQ: Constitutional History and Public Administration
- JS: Local Government
- JX: International Law
K: Law, Civil Rights
L: Education
M: Music
- M: Scores
- ML: Literature of Music
- MT: Musical instruction & study
N: Fine Arts
- NA: Architecture
- NB: Sculpture
- NC: Graphic Arts
- ND: Painting
- NE: Print Media
- NK: Decorative Arts
P: Language and Literature
- P: Philology and Linguistics
- PA: Classical Languages and Literatures
- PC: Romance Languages
- PD-PF: Germanic Languages, including
- PE: English Language
- PG: Slavic Languages and Literatures
- PJ-PL: Oriental Languages and Literatures
- PN: General and Comparative Literature
- PQ: Romance Literatures, Spanish Literature
- PR: English Literature
- PS: American Literature
- PT: Germanic Literature
- PZ: Fiction in English*Juvenile Literature
Q: Science
- QA: Mathematics
- QB: Astronomy
- QC: Physics
- QD: Chemistry
- QE: Geology
- QH: Natural History, Ecology
- QK: Botany
- QL: Zoology
- QM: Human Anatomy
- QP: Physiology
- QR: Bacteriology
R: Medicine
- RA: Public Aspects of Medicine, Death
- RC: Internal Medicine, Practice of Medicine
- RD: Surgery
- RG: Pregnancy, Childbirth, Gynecology
- RJ: Pediatrics
- RM: Therapeutics, Pharmacology, Diet Therapy
- RT: Nursing
S: Agriculture - Conservation
- SB: Plant Culture & Horticulture
- SD: Forestry
- SF: Animal Culture
- SH: Fish Culture & Fisheries
- SK: Hunting Sports
T: Technology
- TA: General Engineering, including General Civil Engineering
- TC: Hydraulic Engineering
- TD: Sanitary and Municipal Engineering
- TE: Highway Engineering
- TF: Railroad Engineering
- TG: Bridge Engineering
- TH: Building Construction
- TJ: Mechanical Engineering
- TK: Electrical Engineering, Nuclear Engineering
- TL: Motor Vehicles, Aeronautics, Astronautics
- TN: Mining Engineering, Mineral Industries, Metallurgy
- TP: Chemical Technology
- TR: Photography
- TS: Manufactures
- TT: Handicrafts, Arts & Crafts, Fashion, Sewing
- TX: Home Economics, Cookery
U: Military Science
V: Naval Science
Z: Bibliography - Word Processing - Library Science
Explore a hypertext version of the Library of Congress Classification Schedule.
The complete Library of Congress call number for any library material may be found by consulting the online catalog.
The library staff will be happy to assist you if you are unable to find the information that you want.