Classification
P - Language and Literature
3,375
R - Medicine
117
Q - Science
81
K - Law
78
H - Social Science
56
B - Philosophy, Psychology, Religion
36
F - General American History
27
J - Political Science
26
D - World History
16
L - Education
10
T - Technology
6
N - Fine Arts
4
S - Agriculture
3
A - General Works
2
C - Historical Sciences
2
Z - Library Science
2
E - United States History
1
M - Music
1