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The Book of Popular Science - Volume 7. (1962). New York: Grolier Incorporated.

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The Book of Popular Science - Volume 7. . New York: Grolier Incorporated, 1962. Text.

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The Book of Popular Science - Volume 7. . New York: Grolier Incorporated, 1962. Text.

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The Book of Popular Science - Volume 7. New York: Grolier Incorporated, 1962. Print.