Classification
H - Social Science
46
S - Agriculture
36
M - Music
14
P - Language and Literature
11
A - General Works
7
R - Medicine
7
D - World History
4
B - Philosophy, Psychology, Religion
2
F - General American History
2
C - Historical Sciences
1
E - United States History
1
J - Political Science
1
N - Fine Arts
1
T - Technology
1