Signum
L - Education
1 807
H - Social Science
136
R - Medicine
124
G - Geography, Anthropology, Recreation
53
P - Language and Literature
47
Q - Science
44
B - Philosophy, Psychology, Religion
36
T - Technology
23
Z - Library Science
18
D - World History
16
A - General Works
14
K - Law
13
N - Fine Arts
13
S - Agriculture
12
E - United States History
9
C - Historical Sciences
5
M - Music
5
F - General American History
3
J - Political Science
3
U - Military Science
1