Classification
D - World History
68
R - Medicine
26
C - Historical Sciences
16
G - Geography, Anthropology, Recreation
13
B - Philosophy, Psychology, Religion
9
E - United States History
4
F - General American History
2
H - Social Science
2
M - Music
2
N - Fine Arts
2
A - General Works
1
P - Language and Literature
1
Q - Science
1