Classification
P - Language and Literature
519
R - Medicine
31
B - Philosophy, Psychology, Religion
26
L - Education
14
D - World History
12
K - Law
11
A - General Works
10
M - Music
10
C - Historical Sciences
9
H - Social Science
8
S - Agriculture
6
F - General American History
5
Q - Science
5
T - Technology
2
J - Political Science
1
N - Fine Arts
1