Classification
S - Agriculture
136
Q - Science
68
T - Technology
56
M - Music
25
R - Medicine
25
H - Social Science
24
G - Geography, Anthropology, Recreation
14
E - United States History
13
C - Historical Sciences
11
A - General Works
9
D - World History
9
L - Education
8
F - General American History
4
Z - Library Science
4
K - Law
2
N - Fine Arts
2
U - Military Science
2
B - Philosophy, Psychology, Religion
1
J - Political Science
1
P - Language and Literature
1