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Nault, William H., Groman, Jeff. (1992). The World Book Encyclopedia, Volume 5: D . London: World Book, Inc..

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Nault, William H., Groman, Jeff. The World Book Encyclopedia, Volume 5: D. London: World Book, Inc., 1992. Text.

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Nault, William H., Groman, Jeff. The World Book Encyclopedia, Volume 5: D. London: World Book, Inc., 1992. Text.

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Nault, William H., Groman, Jeff. The World Book Encyclopedia, Volume 5: D. London: World Book, Inc., 1992. Print.