索引號
F - General American History
60
H - Social Science
19
L - Education
9
J - Political Science
8
P - Language and Literature
6
N - Fine Arts
4
B - Philosophy, Psychology, Religion
2
Q - Science
2
R - Medicine
2
S - Agriculture
2
C - Historical Sciences
1
K - Law
1
M - Music
1
T - Technology
1
V - Naval Science
1