Compton's pictured encyclopedia and fact index : volume 7
F.E. Compton & Company, 1963
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
The Columbia encyclopedia
Columbia University Press, 1950
 Buku Referensi
The encyclopedia Americana
Americana corporation, 1938
 Buku Referensi
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
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