索引號
H - Social Science
80
E - United States History
72
J - Political Science
40
F - General American History
25
P - Language and Literature
25
K - Law
22
M - Music
12
D - World History
9
T - Technology
5
B - Philosophy, Psychology, Religion
4
U - Military Science
4
C - Historical Sciences
3
G - Geography, Anthropology, Recreation
3
L - Education
2
Q - Science
2
R - Medicine
2
S - Agriculture
2
N - Fine Arts
1