This is an outline of the Library of Congress call number classification system. Single letters represent broad topic areas. Double letters represent more specialized topic areas. For a more detailed outline visit the Library of Congress. While the Library of Congress system is used at academic libraries, public libraries tend to use the Dewey Decimal System.
A - General Works
B - Philosophy and Religion
C - History (General)
- BF - Psychology
- BJ - Ethics
- BL - Religions
- BM - Judaism
- BR-BX - Christianity and others
D - History (General and Old World)
- CC - Archaeology
E - U.S. History (General & Old World)
- D - General
- DA - Great Britain
- DC - France
- DD - Germany
- DE - Classical antiquity
- DF - Greece
- DG - Italy
- DK - Russia
- DP - Spain, Portugal
- DS - Asia
- DT - Africa
F - U.S. History (Local). N. & S. America
G - Geography. Anthropology. Recreation
H - Social Science
- G - Atlas. Maps
- GB - Physical geography
- GN - Anthropology
- GR - Folklore
- GT - Manners & customs
- GV - Physical education & sports
I - Not used
- HA - Statistics
- HB-HD - Economics
- HF - Commerce
- HG - Finance
- HM - Sociology
- HQ - Family. Marriage. Women
- HV - Police Science
J - Political Science
K - Law
- JK - U.S. constitution
- JS - Local government
L - Education
- KF - United States
- KFV - Virginia
M - Music
- LA - History of education
N - Fine Arts
O - Not used
- NA - Architecture
- NB - Sculpture
- ND - Painting
- NE - Print media
- NK - Decorative Arts
P - Language & Literature
Q - Science
- PA - Classical language & literature
- PC - French & Spanish
- PE - English Language
- PN - Television. Theater. Journalism
- PR - English Literature
- PS - American Literature
- PT - Germanic Literature
- PZ - Fiction
R - Medicine
- QA - Mathematics. Computer Science
- QB - Astronomy
- QC - Physics
- QD - Chemistry
- QE - Geology
- QH - Biology
S - Agriculture
- RC - Internal Medicine & Mental Health
- RD - Surgery
- RG - Gynecology
- RK - Dentistry
- RS - Pharmacy
- RT - Nursing
T - Technology
- SB - Plant culture
- SD - Forestry
- SF - Animal culture
U - Military Science
- TA - Civil engineering
- TG - Bridge construction
- TH - Building & construction
- TJ - Mechanical engineering
- TK - Electronics. Electrical engineering
- TL - Motor vehicles
- TP - Chemical technology
- TR - Photography
- TT - Handicrafts. Arts & crafts
- TX - Home economics
V - Naval Science
W, X, Y - Not used
Z - Library Science
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