索引號
H - Social Science
89
J - Political Science
26
D - World History
17
B - Philosophy, Psychology, Religion
10
P - Language and Literature
9
F - General American History
7
G - Geography, Anthropology, Recreation
7
L - Education
7
K - Law
4
C - Historical Sciences
3
Q - Science
3
T - Technology
2
A - General Works
1