 NEL, 1973. Cover by Bruce Pennington. |
 orlds of differing
probabilities and the constant search for immortality are
the twin themes of this mind-toppling story. Expanding
the enigmas of time, van Vogt carries the reader to the
furthermost edges of past and future and outwards to a
place where time loses all meaning.Originally published in 1970. Like so many of van Vogt's later books, this one is a "fix-up", based on :
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 Presses Pocket. Date unknown. Cover by Siudmak. |
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 Science Fiction Book Club, 1970. Cover by Gary Viskupic. |
 Pocket, 1977. Cover art by Wojtek Siudmak. |
Ace, 1970. Cover art by John Schoenherr. |
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Ace, 1972. Cover art by John Schoenherr. | |||
