索引号
L - Education
60
P - Language and Literature
30
Q - Science
18
B - Philosophy, Psychology, Religion
17
H - Social Science
17
K - Law
11
D - World History
10
F - General American History
9
G - Geography, Anthropology, Recreation
7
N - Fine Arts
7
R - Medicine
6
J - Political Science
4
T - Technology
4
C - Historical Sciences
3
M - Music
3
S - Agriculture
3
Z - Library Science
3
E - United States History
2