索引号
R - Medicine
28
H - Social Science
22
D - World History
10
L - Education
8
Q - Science
5
B - Philosophy, Psychology, Religion
3
P - Language and Literature
3
A - General Works
2
G - Geography, Anthropology, Recreation
1
J - Political Science
1
K - Law
1
N - Fine Arts
1
S - Agriculture
1
T - Technology
1