Classification
D - World History
55
F - General American History
29
H - Social Science
9
R - Medicine
8
P - Language and Literature
7
B - Philosophy, Psychology, Religion
4
C - Historical Sciences
3
E - United States History
3
L - Education
3
A - General Works
2
K - Law
2
Z - Library Science
2
J - Political Science
1
M - Music
1