Christopher Priest,

The Space Machine , Faber, London, 1976

Keith Roberts,

, Hart-Davies, London, 1968

Carl Sagan,

Contact , Simon & Schuster, New York, 1951

Clifford Simak,

Time and Again , Simon & Schuster, NewYork, 1951

Lee Smolin,

The Life of the Cosmos , Weidenfeld & Nicolson, London, 1997

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