Classification
D - World History
47
H - Social Science
13
Z - Library Science
9
K - Law
8
E - United States History
6
J - Political Science
6
N - Fine Arts
4
P - Language and Literature
4
B - Philosophy, Psychology, Religion
3
C - Historical Sciences
3
G - Geography, Anthropology, Recreation
3
Q - Science
3
R - Medicine
3
A - General Works
2
T - Technology
2
L - Education
1
M - Music
1
U - Military Science
1