Classification
R - Medicine
28
S - Agriculture
21
B - Philosophy, Psychology, Religion
18
M - Music
11
H - Social Science
8
Q - Science
8
T - Technology
8
P - Language and Literature
7
D - World History
6
C - Historical Sciences
3
A - General Works
2
E - United States History
2
K - Law
2
G - Geography, Anthropology, Recreation
1
J - Political Science
1
V - Naval Science
1