Classification
F - General American History
15
K - Law
13
M - Music
13
C - Historical Sciences
9
J - Political Science
9
B - Philosophy, Psychology, Religion
6
D - World History
6
H - Social Science
5
A - General Works
4
P - Language and Literature
4
T - Technology
3
L - Education
2
Q - Science
1
R - Medicine
1
S - Agriculture
1