Cyril Judd was a joint
pseudonym used by American writers Cyril M. Kornbluth and
Judith Merril for their two novels:
[ A Faithful Soldier, Without Fear, by James Nicoll, at JamesDavisNicoll.com; published March 26, 2017; retrieved March 26, 2017]
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Gunner Cade (1952); serialized in Astounding Science Fiction in 1952.
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Outpost Mars (1952, reprinted as Sin in Space in 1961; serialised as Mars Child in Galaxy Science Fiction in 1951.)