The Encyclopedia Americana : volume 23
Americana Corporation, 1977
 Buku Referensi
The Encyclopedia Americana : volume 23
Americana Corporation, 1964
 Buku Referensi
Collier's encyclopedia : volume 23
Macmillan Educational Company, 1990
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The Encyclopedia Americana : volume 23
Grolier, 1994
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The World book encyclopedia : volume 23
World Book, 1985
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