Classification
D - World History
76
M - Music
27
F - General American History
19
P - Language and Literature
10
E - United States History
7
B - Philosophy, Psychology, Religion
4
J - Political Science
4
T - Technology
4
R - Medicine
3
Z - Library Science
3
A - General Works
2
H - Social Science
2
C - Historical Sciences
1
V - Naval Science
1