Produced by Greg Weeks, Adam Styles and the Online Distributed Proofreading Team at http://www.pgdp.net This etext was produced from Analog Science Fact & Fiction September, October, November 1961. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Page numbers jump between issues since they reflect the original magazine pages as can be seen in the detailed notes at the end of this text. Minor typographic errors have been corrected.…
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