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Timewarps,John Gribbin, Delacorte Press, NY, 1979.
Unveiling the Edge of Time John Gribbin, Crown, NY, 1992.
Ahead of Time, Harry Harrison and Theodore J. Gordon, eds., Doubleday & Co., Garden City, NY, 1972.
Time Travel: Myth or Reality?, Richard Heffern, Pyramid Books, NY, 1977.
Time Travel, John W. Macvey, Scarborough House, NY, 1990.
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