索引號
H - Social Science
85
F - General American History
42
L - Education
20
Z - Library Science
13
K - Law
8
J - Political Science
7
G - Geography, Anthropology, Recreation
6
P - Language and Literature
6
Q - Science
5
B - Philosophy, Psychology, Religion
3
S - Agriculture
3
N - Fine Arts
2
R - Medicine
2
T - Technology
2
U - Military Science
2
A - General Works
1
M - Music
1