索引號
D - World History
420
N - Fine Arts
83
T - Technology
66
H - Social Science
65
Q - Science
61
G - Geography, Anthropology, Recreation
48
B - Philosophy, Psychology, Religion
16
U - Military Science
15
S - Agriculture
10
M - Music
8
P - Language and Literature
8
J - Political Science
6
V - Naval Science
6
C - Historical Sciences
1
E - United States History
1
F - General American History
1
L - Education
1
R - Medicine
1