Classification
G - Geography, Anthropology, Recreation
140
P - Language and Literature
45
M - Music
29
D - World History
24
S - Agriculture
18
E - United States History
16
H - Social Science
13
C - Historical Sciences
7
F - General American History
6
T - Technology
5
K - Law
4
A - General Works
2
B - Philosophy, Psychology, Religion
2
Q - Science
2
R - Medicine
1