索引號
H - Social Science
144
K - Law
125
F - General American History
80
J - Political Science
46
L - Education
32
P - Language and Literature
21
G - Geography, Anthropology, Recreation
17
Q - Science
14
S - Agriculture
13
B - Philosophy, Psychology, Religion
10
R - Medicine
10
T - Technology
4
C - Historical Sciences
3
D - World History
2
M - Music
2
N - Fine Arts
2
U - Military Science
2
Z - Library Science
2
E - United States History
1