索引號
H - Social Science
82
K - Law
17
L - Education
17
R - Medicine
15
F - General American History
12
T - Technology
11
P - Language and Literature
9
E - United States History
8
M - Music
8
Z - Library Science
8
J - Political Science
7
Q - Science
7
D - World History
6
G - Geography, Anthropology, Recreation
5
N - Fine Arts
5
A - General Works
3
U - Military Science
2
B - Philosophy, Psychology, Religion
1
C - Historical Sciences
1
S - Agriculture
1