索引號
H - Social Science
81
R - Medicine
35
P - Language and Literature
22
G - Geography, Anthropology, Recreation
20
L - Education
17
Q - Science
17
F - General American History
13
B - Philosophy, Psychology, Religion
12
J - Political Science
10
D - World History
9
K - Law
9
S - Agriculture
9
T - Technology
7
Z - Library Science
5
N - Fine Arts
4
A - General Works
3
M - Music
3
E - United States History
1