Classification
D - World History
16
H - Social Science
9
M - Music
9
E - United States History
5
Z - Library Science
4
P - Language and Literature
3
Q - Science
3
J - Political Science
2
L - Education
2
S - Agriculture
2
A - General Works
1
B - Philosophy, Psychology, Religion
1
C - Historical Sciences
1
F - General American History
1
N - Fine Arts
1