Astronauts Must Not Land/Space-Time Juggler by John Brunner ~ Ace Double #F-227, 1963. Typical vintage American mass market paperback. 224 pages. 40¢ cover price. Cover artist not identified.

Light to moderate wear, good/very good. Stain on one of the covers. Previous owner's name and address rubber-stamped on the inside. As always, grading of vintage paperbacks is subjective so check out my scan and be sure this copy would have a home in your collection before bidding or buying.