Classification
D - World History
83
F - General American History
56
H - Social Science
37
E - United States History
27
A - General Works
13
B - Philosophy, Psychology, Religion
13
Z - Library Science
9
Q - Science
8
G - Geography, Anthropology, Recreation
7
P - Language and Literature
7
C - Historical Sciences
6
N - Fine Arts
6
S - Agriculture
5
J - Political Science
4
K - Law
4
L - Education
3
T - Technology
3
R - Medicine
1