The Encyclopedia Americana : volume 6
Grolier, 1994
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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, 1990
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The World book encyclopedia : volume 6
World Book, 1985
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