索引号
H - Social Science
27
Q - Science
21
L - Education
19
K - Law
13
B - Philosophy, Psychology, Religion
11
P - Language and Literature
10
D - World History
7
M - Music
6
R - Medicine
6
F - General American History
5
T - Technology
5
C - Historical Sciences
4
S - Agriculture
4
N - Fine Arts
3
J - Political Science
2
Z - Library Science
2
A - General Works
1
G - Geography, Anthropology, Recreation
1