Classification
H - Social Science
39
P - Language and Literature
30
T - Technology
23
K - Law
19
S - Agriculture
8
J - Political Science
6
F - General American History
5
M - Music
5
B - Philosophy, Psychology, Religion
4
D - World History
4
A - General Works
3
C - Historical Sciences
3
R - Medicine
3
E - United States History
1