索引号
P - Language and Literature
91
H - Social Science
73
L - Education
15
R - Medicine
13
T - Technology
11
D - World History
10
K - Law
10
G - Geography, Anthropology, Recreation
8
Q - Science
5
Z - Library Science
4
A - General Works
3
N - Fine Arts
3
M - Music
2
S - Agriculture
2
U - Military Science
2
V - Naval Science
1