Classification
H - Social Science
41
P - Language and Literature
12
M - Music
9
R - Medicine
9
G - Geography, Anthropology, Recreation
8
B - Philosophy, Psychology, Religion
6
D - World History
5
E - United States History
3
J - Political Science
2
L - Education
2
A - General Works
1
C - Historical Sciences
1
F - General American History
1
Q - Science
1
T - Technology
1