Classification
M - Music
44
R - Medicine
22
C - Historical Sciences
13
B - Philosophy, Psychology, Religion
7
D - World History
7
H - Social Science
5
F - General American History
3
J - Political Science
3
S - Agriculture
3
Q - Science
2
A - General Works
1
E - United States History
1
K - Law
1
L - Education
1
P - Language and Literature
1