Compton's pictured encyclopedia and fact index : volume 15
F.E. Compton & Company, 1963
Buku Referensi
The Encyclopedia Americana : volume 6
Americana Corporation, 1977
Buku Referensi
The Encyclopedia Americana : volume 6
Americana Corporation, 1964
Buku Referensi
Collier's encyclopedia : volume 6
Macmillan Educational Company, 1990
Buku Referensi
Encyclopedia of knowledge : volume 6
Grolier Incorporated, 1991
Buku Referensi
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