UNM Valencia Valencia Campus Library

Library of Congress Subject Headings

Many academic libraries use the Library of Congress Subject Headings (LCSH) which are divided into 21 branches of knowledge represented by letters:

A - General works
B - Philosophy
C - Auxiliary sciences of history
D - History (general)
E-F - History (Americas)
G - Geography
H - Social sciences
J - Political science
K - Law
L - Education

M - Music
N - Visual arts
P - Language and literature
Q - Science
R - Medicine
S - Agriculture
T - Technology
U - Military science
V - Naval science
Z - Bibliography; library science

Each branch is divided into more specific topics represented by combinations of letters and numbers. For example, the book Teleworking has the call number HD 2336.3 B523 1995:
H - Social sciences and business
HD - Economic history and conditions
2321 - 4730 - Industry
2331 - 2336 - Household Industry
2336.3 - Telecommuting
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