Classification
D - World History
99
H - Social Science
53
L - Education
6
M - Music
6
S - Agriculture
4
G - Geography, Anthropology, Recreation
3
Q - Science
3
A - General Works
2
P - Language and Literature
2
E - United States History
1
J - Political Science
1
N - Fine Arts
1
T - Technology
1
Z - Library Science
1