索引号
P - Language and Literature
84
F - General American History
79
D - World History
49
G - Geography, Anthropology, Recreation
25
H - Social Science
23
B - Philosophy, Psychology, Religion
5
E - United States History
3
M - Music
3
T - Technology
3
C - Historical Sciences
2
N - Fine Arts
2
S - Agriculture
1
Z - Library Science
1