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."
Knud Axel Syrup, chief engineer of the spaceship Mercury Girl, sat and drank his favorite beer and thought about the war he was desperately anxious to avoid. The planetoid he was stranded on, Grendel, was occupied by a band of fiery Irish revolutionaries who weren't loading their guns with shamrocks. And once the Anglians found out about the invasion, they'd make the legendary Donnybrook seem like a harmless rugby match. When Herr Syrup shook up a bottle of brew and let the foam shoot out of the top, he knew what had to be done to get off Grendel. And so came about a marvelous spaceship, built of beer kegs, bound by gunk, upholstered with pretzel boxes and powered - for the first time in space travel history - by the mighty reaction forces of malted brew!

Bound with a collection of novellas/novelets: UN-Man and Other Novellas (cover by Ed Valigursky, 158 pages.)

Un-Man
Margin of Profit
The Live Coward.
These first appeared in Astounding - from 1953 or 1956.

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:
FOR HIM, DEATH WAS NOT FINAL
When the agents of evil murdered Martin Donner, they thought that the UN-man was no more, that they had deprived the world organization of its greatest chance to achieve peace. Now their world-wide conspiracy could take over the entire planet, still recovering from a nuclear war. but if the UN-man was dead, who was this man who looked identically like him, who fought the conspirators with the same fantastic skill and wit which Donner had possessed? Suddenly this new UN-man (or was he really new?) became the object of a planetary search, the outcome of which would determine the future of the world.