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Freeman, Marcia S.. (2009). Rourke's World of Science Encyclopedia (Volume 8). Florida: Rourke Publishing.

Gaya Chicago

Freeman, Marcia S.. Rourke's World of Science Encyclopedia. Volume 8 Florida: Rourke Publishing, 2009. Text.

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Freeman, Marcia S.. Rourke's World of Science Encyclopedia. Volume 8 Florida: Rourke Publishing, 2009. Text.

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Freeman, Marcia S.. Rourke's World of Science Encyclopedia. Volume 8 Florida: Rourke Publishing, 2009. Print.