Classification
D - World History
37
F - General American History
17
M - Music
12
P - Language and Literature
11
H - Social Science
5
R - Medicine
4
Z - Library Science
4
A - General Works
3
B - Philosophy, Psychology, Religion
3
E - United States History
3
K - Law
3
Q - Science
3
J - Political Science
2
T - Technology
2