Classification
D - World History
31
M - Music
11
E - United States History
9
J - Political Science
9
R - Medicine
9
U - Military Science
8
P - Language and Literature
7
B - Philosophy, Psychology, Religion
5
A - General Works
4
F - General American History
4
C - Historical Sciences
2
K - Law
2
H - Social Science
1
T - Technology
1