索引號
L - Education
448
Q - Science
303
H - Social Science
207
R - Medicine
144
S - Agriculture
106
P - Language and Literature
45
T - Technology
40
B - Philosophy, Psychology, Religion
34
J - Political Science
29
G - Geography, Anthropology, Recreation
25
A - General Works
19
K - Law
13
N - Fine Arts
11
Z - Library Science
9
C - Historical Sciences
7
D - World History
7
F - General American History
2