索引號
K - Law
230
H - Social Science
128
J - Political Science
71
L - Education
14
G - Geography, Anthropology, Recreation
6
B - Philosophy, Psychology, Religion
5
P - Language and Literature
5
D - World History
4
T - Technology
4
C - Historical Sciences
2
F - General American History
2
N - Fine Arts
2
U - Military Science
2
S - Agriculture
1