Classification
Q - Science
77
P - Language and Literature
36
M - Music
28
E - United States History
22
T - Technology
16
A - General Works
13
C - Historical Sciences
9
D - World History
6
B - Philosophy, Psychology, Religion
5
S - Agriculture
5
H - Social Science
3
K - Law
2
F - General American History
1
G - Geography, Anthropology, Recreation
1
J - Political Science
1
N - Fine Arts
1
R - Medicine
1