索引號
K - Law
29
H - Social Science
23
P - Language and Literature
23
S - Agriculture
17
Q - Science
14
B - Philosophy, Psychology, Religion
13
L - Education
11
Z - Library Science
11
G - Geography, Anthropology, Recreation
9
C - Historical Sciences
8
J - Political Science
8
T - Technology
8
D - World History
7
N - Fine Arts
6
F - General American History
2
R - Medicine
2
A - General Works
1