Classification
R - Medicine
103
Q - Science
47
B - Philosophy, Psychology, Religion
33
P - Language and Literature
29
S - Agriculture
8
A - General Works
7
D - World History
5
F - General American History
5
T - Technology
5
C - Historical Sciences
3
M - Music
3
G - Geography, Anthropology, Recreation
2
E - United States History
1
H - Social Science
1