Classification
H - Social Science
78
S - Agriculture
51
M - Music
21
D - World History
16
J - Political Science
14
Q - Science
8
K - Law
5
L - Education
5
Z - Library Science
5
T - Technology
4
A - General Works
3
F - General American History
2
G - Geography, Anthropology, Recreation
2
C - Historical Sciences
1
P - Language and Literature
1
R - Medicine
1