索引號
L - Education
688
H - Social Science
27
B - Philosophy, Psychology, Religion
11
Q - Science
9
P - Language and Literature
8
G - Geography, Anthropology, Recreation
4
F - General American History
3
T - Technology
3
Z - Library Science
3
J - Political Science
2
C - Historical Sciences
1
D - World History
1
K - Law
1
R - Medicine
1