Classification
D - World History
63
F - General American History
42
B - Philosophy, Psychology, Religion
35
P - Language and Literature
13
M - Music
8
L - Education
7
R - Medicine
3
Q - Science
2
S - Agriculture
2
V - Naval Science
2
C - Historical Sciences
1
H - Social Science
1
J - Political Science
1
U - Military Science
1
Z - Library Science
1