索引號
L - Education
213
D - World History
14
H - Social Science
14
Q - Science
9
A - General Works
5
R - Medicine
5
B - Philosophy, Psychology, Religion
4
Z - Library Science
4
G - Geography, Anthropology, Recreation
3
P - Language and Literature
2
T - Technology
2
E - United States History
1
F - General American History
1
J - Political Science
1
M - Music
1
U - Military Science
1