Classification
D - World History
47
M - Music
46
R - Medicine
32
H - Social Science
30
B - Philosophy, Psychology, Religion
11
P - Language and Literature
7
F - General American History
6
J - Political Science
4
A - General Works
3
Z - Library Science
3
G - Geography, Anthropology, Recreation
2
C - Historical Sciences
1
E - United States History
1