索引號
H - Social Science
420
L - Education
293
R - Medicine
207
S - Agriculture
136
Q - Science
123
B - Philosophy, Psychology, Religion
117
Z - Library Science
105
T - Technology
60
F - General American History
55
J - Political Science
41
G - Geography, Anthropology, Recreation
38
K - Law
34
P - Language and Literature
17
D - World History
12
N - Fine Arts
6
U - Military Science
5
C - Historical Sciences
3
A - General Works
2
M - Music
1