索引號
L - Education
514
Q - Science
323
H - Social Science
264
R - Medicine
164
S - Agriculture
107
P - Language and Literature
54
T - Technology
48
B - Philosophy, Psychology, Religion
41
J - Political Science
35
G - Geography, Anthropology, Recreation
33
A - General Works
22
K - Law
19
N - Fine Arts
15
Z - Library Science
15
D - World History
9
C - Historical Sciences
7
F - General American History
2