Classification
D - World History
18
M - Music
11
H - Social Science
10
Q - Science
9
E - United States History
8
K - Law
8
S - Agriculture
7
F - General American History
4
J - Political Science
4
P - Language and Literature
3
B - Philosophy, Psychology, Religion
2
C - Historical Sciences
2
G - Geography, Anthropology, Recreation
2
A - General Works
1
N - Fine Arts
1
R - Medicine
1
Z - Library Science
1