Synopsis
History
First publication: If, serialized January to March 1964
Review
Videos
We have the story in these editions:
Three Worlds to Conquer, paperback, Pyramid Books, 1968-08-00
Worlds of If Science Fiction, January 1964, edited by Frederik Pohl, magazine, Galaxy Publishing, 1964-01-00
All of the stories in the Sam Hall Universe series:
Sam Hall
Three Worlds to Conquer