Signum
D - World History
15 589
H - Social Science
15 354
J - Political Science
5 576
E - United States History
2 306
L - Education
1 143
P - Language and Literature
1 073
F - General American History
1 050
B - Philosophy, Psychology, Religion
716
U - Military Science
505
K - Law
435
G - Geography, Anthropology, Recreation
240
Z - Library Science
209
A - General Works
190
N - Fine Arts
179
T - Technology
159
C - Historical Sciences
147
M - Music
89
Q - Science
30
R - Medicine
28
S - Agriculture
23
V - Naval Science
10