Library of Congress Classification System

The Leddy Library uses the Library of Congress (LC) Classification System to arrange books and journals on the shelves. This system organizes materials into broad subject categories which are represented by the letters of the alphabet you see at the start of each call number on the spine of a book. 

Call Numbers Subjects of books and journals found among this range
A General Works, Generalities
B-BD Philosophy
BF Psychology
BH- BJ Aesthetics, Ethics, Etiquette
BL-BX Religion
C-CT Archaeology, Genealogy, Biography
D History (General)
DA-DR History of Europe
DS-DX History of Asia, Africa, Oceania
E-F History of the United States, Canada
G-GF Geography
GN Anthropology
GR-GV Folklore, Manners, Customs, Sports, Recreation
H- HA Social Sciences (General), Statistics
HB-HD Economics
HE Transportation, Communications
HF-HJ Commerce, Finance, Public Finance
HM-HX Sociology
J-JZ Political Science
K-KDZ Law (General), Law (United Kingdom and Ireland)
KE Law (Canada)
KF Law (United States)
KG-KKZ Law (Latin America, South America, Europe)
L Education
M Music
N Fine Arts
P-PA Linguistics, Greek and Latin language, literature
PB-PH Modern European languages
PJ-PK Oriental languages and Literature, Indo-Iranian languages
PL Eastern Asia, Africa, Oceania (languages and literature)
PM Native and Inuit Languages
PN Literary history and collections, performing arts (including film and broadcasts) and journalism
PQ French, Italian, Spanish, Portuguese literatures
PR English literature
PS American and Canadian literature
PT German, Dutch, Afrikaan and Scandinavian Literature
PZ Juvenile Fiction
Q Science (General), Information theory
QA Mathematics, Computer Science
QB Astronomy
QC Physics
QD Chemistry
QE Geology
QH Natural history, Biology
QK Botany
QL Zoology
QM Human Anatomy
QP Physiology
QR Microbiology
R-RM Medicine
RT Nursing
RV-RZ Homeopathy, Other forms of medicine
S Agriculture, Plants and animals.
T Technology
TA-TP Engineering
TR Photography
TS Manufactures
TT-TX Arts and crafts, Home economics
U-V Military and Naval Science
Z Books, the book industries and trade, Libraries, Information resources