索引號
H - Social Science
25
D - World History
11
Q - Science
10
R - Medicine
6
G - Geography, Anthropology, Recreation
5
P - Language and Literature
5
Z - Library Science
5
M - Music
4
N - Fine Arts
4
K - Law
3
L - Education
3
T - Technology
3
J - Political Science
2
S - Agriculture
1
U - Military Science
1