Signum
P - Language and Literature
143 393
H - Social Science
30 222
D - World History
20 357
M - Music
17 093
L - Education
13 191
B - Philosophy, Psychology, Religion
12 094
E - United States History
11 504
R - Medicine
10 486
Q - Science
10 434
K - Law
10 304
G - Geography, Anthropology, Recreation
8 374
N - Fine Arts
8 374
F - General American History
7 649
T - Technology
7 256
J - Political Science
5 073
Z - Library Science
2 621
V - Naval Science
2 066
A - General Works
2 039
S - Agriculture
1 555
C - Historical Sciences
1 335
U - Military Science
1 135