The letters in a call number correspond to a subject area.
A - General Works
B - Philosophy, Psychology, and Religion
C - Auxiliary Sciences of History
D - General and Old World History
E - History of America
F - History of the United States and British, Dutch, French, and Latin America
G - Geography, Anthropology, and Recreation
H - Social Sciences
J - Political Science
K - Law
L - Education
M - 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, and General Information Resources