Classification
Q - Science
88
T - Technology
46
S - Agriculture
26
D - World History
16
H - Social Science
15
G - Geography, Anthropology, Recreation
11
A - General Works
8
P - Language and Literature
8
L - Education
7
R - Medicine
7
Z - Library Science
5
K - Law
4
N - Fine Arts
4
B - Philosophy, Psychology, Religion
3
J - Political Science
3
M - Music
3
C - Historical Sciences
2
F - General American History
2
U - Military Science
2
E - United States History
1