索引號
H - Social Science
109
Q - Science
95
F - General American History
51
L - Education
28
J - Political Science
27
K - Law
17
P - Language and Literature
17
G - Geography, Anthropology, Recreation
9
T - Technology
4
N - Fine Arts
3
M - Music
2
S - Agriculture
2
B - Philosophy, Psychology, Religion
1
C - Historical Sciences
1
D - World History
1
Z - Library Science
1