N° 1 - mars 1940
Couverture ?

World Reborn • Thornton Ayre • nv
The Lotus-Engine • Raymond Z. Gallun • ss
Guyon 45X • Dean D. O'Brien • nv
Phantom from Space • John Russell Fearn • 
Gravity Island • Harl Vincent • ss
Trans-Plutonian Trap • Ross Rocklynne • nv
Emergency Refueling • James Blish • ss
A Stitch in Time • Frank Belknap Long, Jr. • ss

N° 2 - mai 1940
Couverture de Gabriel Mayorga

Hollow of the Moon [by Manly Wade Wellman] • Gabriel Barclay • nv
Guardian Angel • Raymond Z. Gallun • ss
Let There Be Light • Lyle Monroe • ss
Bequest of the Angel [with Harry Dockweiler] • James Blish • ss
Juice • L. Sprague de Camp • ss
Arton's Metal • Ray Cummings • ss
Living Isotopes • P. Schuyler Miller • ss
King Cole of Pluto • S. D. Gottesman • nv
Castaway • Donald A. Wollheim • ss

N° 3 - juillet 1940
Couverture ?

The Day of the Comet • Frederic Arnold Kummer, Jr. • nv
The Timeless Ones • Harry Walton • ss
Outlaws on Venus • John E. Harry • ss
Trouble Shooter • Harl Vincent • nv
Sigma Lyra Passes • Oliver Saari • ss
The Thought-Woman • Ray Cummings • ss
Before the Universe [with Frederik Pohl; *Clair & Gaynor] • S. D. Gottesman • nv
Europa Enchantment • Henry Andrew Ackermann • ss

N° 4 - septembre 1940
Couverture de Sherry

Invisible One • Neil R. Jones • nv
The Invasion • Robert Willey • ss
The Girl in the Bottle • Jack Williamson • nv
Men on the Morning Star • Charles Henry Mackintosh • ss
Strange Playfellow • Isaac Asimov • ss
Venusian Tragedy • Max C. Sheridan • nv
Rebirth of Man • Basil E. Wells • ss
The Radium-Bugs • Helen Weinbaum • ss
Phantom from Neptune • Henry Andrew Ackermann • ss

N° 5 - novembre 1940
Couverture de Leo Morey

Cepheid Planet • R. R. Winterbotham • nv
Asokore Power • L. Sprague de Camp • ss
Dimension-Hazard • Hal K. Wells • ss
The Horizontals • Frank Belknap Long • ss
The Monster on the Border • William F. Temple 
Secret of the Crypt • Oliver Saari • ss
Mutiny in Hell • William A. Rossi • ss
Nova Midplane • S. D. Gottesman • ss
The Outpost at Altark • Robert A. W. Lowndes • ss

N° 6 - janvier 1941
Couverture ?

Collision Course • Ross Rocklynne • ss
Buckethead • Arthur G. Stangland • ss
Water Pirate • Leigh Brackett • ss
Vacant World [with Frederik Pohl & C. M. Kornbluth] • Dirk Wylie • nv
The Dweller in the Ice • James MacCreigh • ss
Beings Like These • Graph Waldeyer • nv
Blue Boy • E. A. Grosser • ss
Another's Eyes • John L. Chapman • ss
Under the Sand-Seas • Oliver Saari • nv

N° 7 - mars 1941
Couverture ?

Genus Homo • L. Sprague de Camp & P. Schuyler Miller • n.
History • Isaac Asimov • ss
Space-War Strategy • Malcolm Jameson • ar
Almost Human • Ray Cummings • ss
A Voyage in Time • Warren F. Howard • ss
Captives of the Durna Rangue • Neil R. Jones 

N° 8 - mai 1941
Couverture ?

Mission Unknown! • Henry Hasse • na
Smugglers of the Moon • P. Schuyler Miller • ss
Best Friend [with Frederik Pohl] • S. D. Gottesman 
Interstellar Way-Station • Bob Tucker • ss
The Brothers • Michael D. Shea • ss
The Rannie • Willard E. Hawkins • nv

N° 9 - aoϋt 1941
Couverture de Sherry

Aerita of the Light Country • Ray Cummings • 
Vendetta on Venus • Kerry Lash • ss
Willie Wins a War • E. A. Grosser • ss
Invaders from Nowhere • L. Sprague de Camp • 
Higgledy's Pig • Myer Krulfeld • ss
The Thought Chariot • Simpson M. Ritter • ms
The Psychopathic Martians • Allan Ingvald Benson 
Stranger from Smallness • Otis Adelbert Kline • nv

N° 10 - novembre 1941
Couverture ?

Lost Legion • Lyle Monroe • na
The Biped, Reegan • Alfred Bester • ss
Tumithak of the Towers of Fire [*Tumithak] • Charles R. Tanner • nv
Pendulum • Ray Bradbury & Henry Hasse • ss
Red Gem of Mercury • Henry Kuttner • nv
Monster of the Moon • Ray Cummings • s