Classification
H - Social Science
66
D - World History
35
M - Music
24
P - Language and Literature
16
S - Agriculture
8
G - Geography, Anthropology, Recreation
7
L - Education
7
J - Political Science
6
K - Law
4
R - Medicine
4
U - Military Science
4
A - General Works
3
B - Philosophy, Psychology, Religion
3
E - United States History
3
T - Technology
3
N - Fine Arts
2
C - Historical Sciences
1
Q - Science
1
Z - Library Science
1