索引號
D - World History
25
P - Language and Literature
18
H - Social Science
9
Z - Library Science
8
J - Political Science
6
B - Philosophy, Psychology, Religion
5
E - United States History
5
F - General American History
4
G - Geography, Anthropology, Recreation
4
L - Education
3
C - Historical Sciences
1
M - Music
1
N - Fine Arts
1
T - Technology
1