Classification
R - Medicine
88
H - Social Science
38
B - Philosophy, Psychology, Religion
24
F - General American History
15
A - General Works
11
P - Language and Literature
8
C - Historical Sciences
5
M - Music
4
T - Technology
4
S - Agriculture
3
D - World History
2
Z - Library Science
2
G - Geography, Anthropology, Recreation
1
U - Military Science
1