Classification
C - Historical Sciences
82
F - General American History
61
B - Philosophy, Psychology, Religion
40
T - Technology
33
E - United States History
23
R - Medicine
20
D - World History
12
Q - Science
10
H - Social Science
6
S - Agriculture
4
P - Language and Literature
2
G - Geography, Anthropology, Recreation
1
J - Political Science
1
L - Education
1
V - Naval Science
1