索引號
H - Social Science
57
D - World History
21
R - Medicine
11
J - Political Science
10
L - Education
9
G - Geography, Anthropology, Recreation
7
P - Language and Literature
7
K - Law
5
T - Technology
4
Q - Science
3
S - Agriculture
3
U - Military Science
3
A - General Works
2
B - Philosophy, Psychology, Religion
2
C - Historical Sciences
1
Z - Library Science
1