Classification
P - Language and Literature
70
M - Music
47
F - General American History
30
T - Technology
27
H - Social Science
24
R - Medicine
16
D - World History
14
Q - Science
9
C - Historical Sciences
8
A - General Works
7
K - Law
7
B - Philosophy, Psychology, Religion
6
E - United States History
4
J - Political Science
3
S - Agriculture
3
Z - Library Science
1