Classification
P - Language and Literature
65
B - Philosophy, Psychology, Religion
11
R - Medicine
11
D - World History
8
L - Education
8
Q - Science
7
H - Social Science
6
J - Political Science
5
M - Music
5
S - Agriculture
5
F - General American History
3
K - Law
3
C - Historical Sciences
2
A - General Works
1
T - Technology
1
U - Military Science
1