Classification
D - World History
87
L - Education
22
A - General Works
20
B - Philosophy, Psychology, Religion
16
P - Language and Literature
16
H - Social Science
10
N - Fine Arts
5
M - Music
4
J - Political Science
3
R - Medicine
2
T - Technology
2
E - United States History
1
Q - Science
1
U - Military Science
1