THE MAKESHIFT ROCKET+UN-MAN
Ace-Double (1 author)
Ed Emshwiller; Edward Valigursky
Ace Double (F-139) 1962 paperback; 40 cent cover price. Condition is near-Fine: very tight and square with flat spine; very light overall wear as a finger-crease on each side that gets lost in the artwork; age tanning is mild and uniform. No stamps, marks or writing - a clean copy that looks unread.
An Ace Double from 1962 with both sides by Poul Anderson: The Makeshift Rocket, bound with a collection UN-Man and Other Novellas. This is the first book appearance for each.
The Makeshift Rocket - (cover by Ed Emshwiller, 97 pages.) Magazine appearance in Astounding November and December 1958 as "A Bicycle Built for Brew."
The lead short novel is part of his "planetary engineers" future history - later called the Psychotechnic League series. Since I read this decades ago an remember very little of the plot, here's the first page blurb: