Classification
R - Medicine
37
D - World History
26
H - Social Science
16
T - Technology
16
Q - Science
14
S - Agriculture
12
N - Fine Arts
10
Z - Library Science
9
G - Geography, Anthropology, Recreation
6
B - Philosophy, Psychology, Religion
5
A - General Works
4
P - Language and Literature
4
C - Historical Sciences
2
E - United States History
2
F - General American History
2
J - Political Science
2
L - Education
2
K - Law
1
M - Music
1