N° 1 - printemps 1950
Couverture ?

The Hidden World • Edmond Hamilton • n
The Molten Bullet • Anthony M. Rud • ss 
Red Shards on Ceres • Raymond Z. Gallun • ss 
The Star Slaver • Carter Sprague • ss
The Ideal [*Van Manderpootz] • Stanley G. Weinbaum • ss 
Death at the Observatory • John Russell Fearn 
A Visit to Venus • Festus Pragnell • nv
Cosmic Stage • Robert Arthur • ss 
Trespass! • Poul Anderson & Gordon Dickson • ss
Children of the Ray • J. Harvey Haggard

N° 2 - ιtι 1950
Couverture ?

The Exile of the Skies • Richard Vaughan • n.
The Light Bender • Frank K. Kelly • ss
The Last Planet • R. F. Starzl • nv
The Bore • James Blish • ss
The Man from Beyond • John Beynon Harris •
A Thief in Time • Raymond A. Young • ss
The Moon and Mr. Wick • Jack Williamson • ss

N° 3 - automne 1950
Couverture ?

In Caverns Below • Stanton A. Coblentz • n
The Invincible Midge • Paul Ernst • ss
The Spore Doom [by Earl Binder & Otto Binder] • Eando Binder • nv
Beyond the Star Curtain • Garth Bentley • nv
The Space Lens • Millard Verne Gordon • ss
The Ancient • William Morrison • ss
The Long Flight • Carter Sprague • ss

N° 4 - hiver 1951
Couverture ?

Enslaved Brains [by Earl Binder & Otto Binder] • Eando Binder • n.
Invisible ["Shadow-Man"] • Eric Frank Russell •
The Amazing Planet • Clark Ashton Smith • na
Museum • Frank Belknap Long • ss
The Cosmic Cocktail • Siegfried Wagener • ss
When Flame Globes Dance • Milton Lesser • ss
The Reign of the Reptiles • A. Connell • n

N° 5 - printemps 1951
Couverture ?

Vandals of the Void [*Jack Sanders] • J. M. Walsh • n.
Earth's Lucky Day • Francis Flagg & Forrest J. Ackerman • ss
The Osmotic Theorem • S. P. Meek • nv
Block • Carter Sprague • ss
The Mighty Fallen • Damon Knight • ss
Emotion Solution • Arthur K. Barnes • ss

N° 6 - ιtι 1951
Couverture ?

The Conquerors [*Harry Brunton] • David H. Keller
World's Pharaoh [by Henry Kuttner; *Pete Manx] • Kelvin Kent • ss
Dream's End • A. Connell • ss
Via the Hewitt Ray • M. F. Rupert • nv
The Ambassador's Tomcat • Allen Kim Lang • ss
I Do Not Like Thee... • Matt Lee • ss
Men of Honor • Will Garth • vi
Too Dense to Die • Dave Dryfoos • ss

N° 7 - automne 1951
Couverture ?

Beyond Pluto • John Scott Campbell • n
Trail Blazer • Raymond Z. Gallun • ss
The Cosmic Pantograph • Edmond Hamilton •
The Reporter • Chad Oliver • ss
Uranian Justice • Wilbur S. Peacock • ss
Vermin • William Morrison • ss
Displaced Person • Mack Reynolds • ss
Via Asteroid [*Via] • Gordon A. Giles • ss

N° 8 - hiver 1952
Couverture ?

The Evening Star [*Harry Brunton] • David H. Keller • n.
Time Limit • H. B. Fyfe • ss
Within the Planet • Wesley Arnold • nv
The Blunderer • L. Sprague de Camp • ss
Four-Legged Hotfoot [*Johnny Norsen] • Mack Reynolds • ss
Adaptation • Robert Moore Williams • ss
Via Death [*Via] • Gordon A. Giles • ss

N° 9 - printemps 1952
Couverture ?

Dawn of Flame [*Black Margot] • Stanley G. Weinbaum • nv
The Black Flame [*Black Margot] • Stanley G. Weinbaum • n
Thin End • J. W. Groves •
Third Alternative • Sam Merwin, Jr. • ss
Men on Mars • Laurence Manning • ss

N° 10 - ιtι 1952
Couverture ?

Slan • A. E. van Vogt • n
The House on the Vacant Lot • Mari Wolf • ss
The Veil of Astellar • Leigh Brackett • nv
It's a Dog's Life • Larry Clinton • ss
Lunar Parasites • Raymond Z. Gallun • ss
Something Borrowed • Daniel Keyes • ss

N° 11 - automne 1952
Couverture de Emsh

A Million Years to Conquer • Henry Kuttner • n
Second Chance • Walter Kubilius & Fletcher Pratt 
Orphan of Space • Don Wilcox • ss
The Hunters • Alfred Coppel • ss
Greenhorn • Harry Stine • ss
The Question • Ralph Carghill • ss
Science Can Wait • Ray Cummings • ss

N° 12 - novembre 1952
Couverture d'Earle Bergey

The Gods Hate Kansas • Joseph J. Millard • na
The Moebius Room • Robert Donald Locke • ss
The Girl Next Door • Kendell Foster Crossen • ss
"It's Like This" [*Lefty Baker] • Rog Phillips • ss
In Sheep's Clothing • Alan E. Nourse • ss
The Deciding Factor • Paul Lawrence Payne • ss
A Family Matter • Walter M. Miller, Jr. • ss