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Rittner, Don, McCabe, Timothy L.. (2004). Encyclopedia of Biology . New York: Facts On File.

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Rittner, Don, McCabe, Timothy L.. Encyclopedia of Biology. New York: Facts On File, 2004. Text.

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Rittner, Don, McCabe, Timothy L.. Encyclopedia of Biology. New York: Facts On File, 2004. Text.

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Rittner, Don, McCabe, Timothy L.. Encyclopedia of Biology. New York: Facts On File, 2004. Print.