索引號
P - Language and Literature
586
H - Social Science
55
L - Education
37
T - Technology
21
K - Law
14
Q - Science
11
R - Medicine
10
S - Agriculture
10
Z - Library Science
8
D - World History
7
F - General American History
7
A - General Works
6
G - Geography, Anthropology, Recreation
5
J - Political Science
5
N - Fine Arts
5
B - Philosophy, Psychology, Religion
4
E - United States History
4
M - Music
3
C - Historical Sciences
1
U - Military Science
1