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Culver, Roger B.. (1979). Astronomy . New York: Barnes and Noble Books.

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Culver, Roger B.. Astronomy. New York: Barnes and Noble Books, 1979. Text.

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Culver, Roger B.. Astronomy. New York: Barnes and Noble Books, 1979. Text.

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Culver, Roger B.. Astronomy. New York: Barnes and Noble Books, 1979. Print.