It is most notable for Life-Line, the first published work by Robert A. Heinlein. It also has the final work for Street & Smith by Virgil Finlay, who provided the cover.

Contents: 

The Luck of Ignatz by Lester Del Rey

Heavy Planet by Milton A. Rothman (as Lee Gregor)

General Swamp, C.I.C. by L. Ron Hubbard (as Frederick Engelhardt) (part 1 of 2)

Isotope 235 by John W. Campbell, Jr. (as Arthur McCann)

Space War by Willy Ley

Life-Line by Robert A. Heinlein

Stowaway by Nelson S. Bond

The Blue Giraffe by L. Sprague de Camp

An Ultimatum From Mars by Ray Cummings

Pleasure Trove by P. Schuyler Miller

Interior art by Gilmore, W. A. Koll, R. Isip, Edd Cartier, and H. W. Wesso

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