索引號
Q - Science
90,849
H - Social Science
78,706
T - Technology
60,061
S - Agriculture
39,734
F - General American History
37,022
P - Language and Literature
34,248
R - Medicine
22,490
L - Education
20,806
B - Philosophy, Psychology, Religion
16,747
G - Geography, Anthropology, Recreation
13,257
D - World History
7,997
J - Political Science
6,514
N - Fine Arts
6,424
K - Law
4,040
Z - Library Science
3,341
M - Music
1,422
A - General Works
1,020
C - Historical Sciences
934
U - Military Science
851
E - United States History
820
V - Naval Science
359