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The story can also be found in the anthologies Nebula Award Stories Three (1968), edited by Roger Zelazny, Analog 7 (1970), edited by John W. Campbell, Jr., The Hugo Winners, Volume 2: (1963-70) (1971), edited by Isaac Asimov, The Ascent of Wonder: The Evolution of Hard SF (1994), edited by David G. Hartwell and Kathryn Cramer, and Wings of Fire (2010), edited by Jonathan Strahan and Marianne S. Jablon. It is incorprotated in the fixup novel Dragonflight (1968).