索引號
A - General Works
180
F - General American History
54
L - Education
13
H - Social Science
12
D - World History
7
P - Language and Literature
6
B - Philosophy, Psychology, Religion
4
J - Political Science
3
R - Medicine
3
G - Geography, Anthropology, Recreation
2
Q - Science
2
C - Historical Sciences
1
K - Law
1
M - Music
1
N - Fine Arts
1
T - Technology
1
Z - Library Science
1