Signum
H - Social Science
13
P - Language and Literature
12
F - General American History
9
G - Geography, Anthropology, Recreation
6
Z - Library Science
5
E - United States History
4
K - Law
3
N - Fine Arts
3
Q - Science
3
R - Medicine
3
T - Technology
3
A - General Works
2
D - World History
2
B - Philosophy, Psychology, Religion
1
M - Music
1
U - Military Science
1