Classification
H - Social Science
100
R - Medicine
57
M - Music
48
D - World History
31
S - Agriculture
17
F - General American History
12
A - General Works
11
B - Philosophy, Psychology, Religion
9
C - Historical Sciences
7
E - United States History
2
G - Geography, Anthropology, Recreation
1
J - Political Science
1
K - Law
1
L - Education
1
P - Language and Literature
1
T - Technology
1