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Contents differ from Ace 1969 edition. Also in pb (Panther Dec 75). |
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Ballantine 1961 edition omits Adepts Gambit. |
Omits Adepts Gambit. |
This edition adds two stories not in the Arkham House ed. |
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Also in pb (Panther 1975). |
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Bound with The Million Year Hunt by Kenneth Bulmer. |
Expanded version of Two Sought Adventure. |
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Edited by Brian Davis. |
edited by John J. Pierce. |
Fix-up novel rewritten from four stories. Also as The Planet Explorer (Avon 1957). |
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Fix-up novel rewritten from three stories. |
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