Classification
D - World History
44
F - General American History
30
M - Music
13
C - Historical Sciences
12
J - Political Science
9
P - Language and Literature
5
E - United States History
4
L - Education
4
H - Social Science
3
Q - Science
3
A - General Works
2
Z - Library Science
2
B - Philosophy, Psychology, Religion
1
K - Law
1
N - Fine Arts
1
S - Agriculture
1
U - Military Science
1