索引号
H - Social Science
45
R - Medicine
18
D - World History
16
A - General Works
6
Q - Science
6
T - Technology
6
P - Language and Literature
4
U - Military Science
3
G - Geography, Anthropology, Recreation
2
K - Law
2
N - Fine Arts
2
Z - Library Science
2
B - Philosophy, Psychology, Religion
1
M - Music
1
S - Agriculture
1