| Appeared in | Magazine Galaxy Aug 1962 |
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| Appeared in | Anthology Stories from the Hugo Winners Volume II 1971, Isaac Asimov, 0-449-01880-6, Fawcett, m |
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| Appeared in | Anthology The Hugo Winners (Volume 2) 1971, Isaac Asimov, Doubleday |
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| Appeared in | Anthology The Hugo Winners: 1963-1967 1973, Isaac Asimov, Sphere |
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