Classification
D - World History
38
R - Medicine
30
B - Philosophy, Psychology, Religion
26
F - General American History
23
C - Historical Sciences
5
A - General Works
4
E - United States History
4
H - Social Science
4
T - Technology
2
U - Military Science
2
J - Political Science
1
L - Education
1
M - Music
1
V - Naval Science
1
Z - Library Science
1