Classification
H - Social Science
40
T - Technology
25
Z - Library Science
15
R - Medicine
14
E - United States History
12
L - Education
10
B - Philosophy, Psychology, Religion
9
D - World History
8
C - Historical Sciences
6
K - Law
6
M - Music
5
J - Political Science
4
F - General American History
3
S - Agriculture
3
G - Geography, Anthropology, Recreation
2
A - General Works
1