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 - ao�t 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