Classification
T - Technology
195
P - Language and Literature
146
R - Medicine
92
B - Philosophy, Psychology, Religion
71
E - United States History
59
C - Historical Sciences
33
D - World History
25
A - General Works
20
Q - Science
18
L - Education
11
M - Music
11
S - Agriculture
10
F - General American History
8
H - Social Science
6
G - Geography, Anthropology, Recreation
4
U - Military Science
3
J - Political Science
2
K - Law
2
V - Naval Science
2