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Krammer, Barbara. John Glenn: A Space Biography. Berkeley Heights, NJ: Enslow Publishers, Inc., 1998.

Blacknall, Carolyn. Sally Ride: America’s First Woman in Space. Minneapolis: Dillon Press, Inc., 1984.

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Simon, Seymour. Mercury. New York: Morrow Junior Book, 1992.

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Skurzynski, Gloria. "Zero Gravity." New York; Bradbury Press, 1994.

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www.Moon-watch.com

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