Classification
S - Agriculture
108
P - Language and Literature
36
M - Music
28
H - Social Science
26
D - World History
10
C - Historical Sciences
6
B - Philosophy, Psychology, Religion
5
F - General American History
4
Q - Science
3
R - Medicine
3
A - General Works
2
G - Geography, Anthropology, Recreation
1
L - Education
1
T - Technology
1