索引号
H - Social Science
32
Q - Science
16
D - World History
11
R - Medicine
8
K - Law
6
L - Education
6
B - Philosophy, Psychology, Religion
5
G - Geography, Anthropology, Recreation
5
J - Political Science
4
S - Agriculture
4
A - General Works
3
N - Fine Arts
3
P - Language and Literature
3
T - Technology
2
C - Historical Sciences
1
M - Music
1
U - Military Science
1
Z - Library Science
1