Classification
D - World History
51
F - General American History
38
H - Social Science
13
A - General Works
7
L - Education
6
Z - Library Science
6
P - Language and Literature
5
M - Music
4
B - Philosophy, Psychology, Religion
3
R - Medicine
3
C - Historical Sciences
1
N - Fine Arts
1
Q - Science
1
T - Technology
1