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Astounding Science Fiction, Vol. XLVII [47], No. 3, (May 1951) featuring Galactic Gadgeteers, Izzard and the Membrane, Success Story, Guess Again, Key Decision, Clipper Ships in Space, and The Argonne Heavy Water Reactor.
New York, NY: Street & Smith, 1951. First Edition, 1st Printing. Softcover Digest.