索引號
P - Language and Literature
53
H - Social Science
47
G - Geography, Anthropology, Recreation
21
M - Music
16
F - General American History
14
D - World History
12
L - Education
10
Q - Science
10
T - Technology
7
B - Philosophy, Psychology, Religion
5
N - Fine Arts
5
R - Medicine
4
C - Historical Sciences
2
J - Political Science
2
K - Law
2
Z - Library Science
2
E - United States History
1