Signum
L - Education
59
H - Social Science
25
R - Medicine
8
Z - Library Science
8
Q - Science
7
P - Language and Literature
6
B - Philosophy, Psychology, Religion
5
C - Historical Sciences
3
E - United States History
3
K - Law
3
T - Technology
3
A - General Works
2
D - World History
2
G - Geography, Anthropology, Recreation
2
N - Fine Arts
2
F - General American History
1
J - Political Science
1