Classification
D - World History
46
F - General American History
29
H - Social Science
25
N - Fine Arts
12
M - Music
11
C - Historical Sciences
7
E - United States History
5
T - Technology
5
G - Geography, Anthropology, Recreation
4
A - General Works
3
Z - Library Science
3
J - Political Science
2
K - Law
2
P - Language and Literature
2
B - Philosophy, Psychology, Religion
1
L - Education
1
Q - Science
1
R - Medicine
1
S - Agriculture
1