Signum
R - Medicine
1 545
Q - Science
261
B - Philosophy, Psychology, Religion
86
T - Technology
52
H - Social Science
31
G - Geography, Anthropology, Recreation
20
Z - Library Science
17
S - Agriculture
11
P - Language and Literature
9
D - World History
7
F - General American History
7
K - Law
7
L - Education
7
J - Political Science
3
E - United States History
1