索引號
D - World History
359
B - Philosophy, Psychology, Religion
227
H - Social Science
144
P - Language and Literature
126
N - Fine Arts
91
M - Music
32
L - Education
26
J - Political Science
19
T - Technology
19
U - Military Science
15
K - Law
8
C - Historical Sciences
6
Z - Library Science
6
A - General Works
5
R - Medicine
5
G - Geography, Anthropology, Recreation
4
Q - Science
4
S - Agriculture
2
E - United States History
1