Classification
H - Social Science
18
Q - Science
6
T - Technology
5
J - Political Science
4
C - Historical Sciences
3
D - World History
3
P - Language and Literature
3
K - Law
2
L - Education
2
B - Philosophy, Psychology, Religion
1
E - United States History
1
F - General American History
1
M - Music
1
R - Medicine
1