N° 1 - 1937
Couverture de Nick

Superhuman • Geoffrey Armstrong • ss
Seeds from Space • John Russell Fearn • nv
Revolt on Venus • W. P. Cockroft • nv
Man of the Future • Festus Pragnell • ss
Monsters of the Moon • Francis Parnell • ss
The Prr-r-eet • Eric Frank Russell • nv
Invaders from the Atom • Maurice G. Hugi • nv
The Perfect Creature • John Beynon • nv

N° 2 - printemps 1938
Couverture de Nick

Sleepers of Mars • John Beynon • na
Stenographer's Hands • David H. Keller, M.D. •
Invaders from Venus • Benson Herbert • nv
Super-Senses • Maurice G. Hugi • ss
Through Earth's Core • John Russell Fearn • nv
Lunar Lilliput • William F. Temple • nv

N° 3 - été 1938
Couverture ?

The World's Eighth Wonder • Eric Frank Russell • 
The Man Who Lived Backwards • Charles F. Hall •
The Horror in the Telescope • Edmond Hamilton •
Satellites of Death • Leslie J. Johnson • ss
The Puff-Ball Menace ["Spheres of Hell", as by John Beynon Harris] • John Beynon • nv
The Giant Bacillus • H. O. Dickinson • nv
The Last Lunarians ["The Moon Devils"] • John Beynon Harris • ss
The Midget from Mars • Thomas Sheridan • ss

N° 4 - automne 1938
Couverture de W.J. Roberts

The Menace from Space • John Edwards • nv  Out of the Past • Lloyd Arthur Eshbach • ss
The Smile of the Sphinx • William F. Temple • n
The Eternal Professors • David H. Keller, M.D. •
The Sea Terror ["The Sea Horror"] • Edmond Hamilton • nv
The Third Vibrator • John Beynon Harris • ss
The Essence of Life • Festus Pragnell • nv

N° 5 - hiver 1938
Couverture de W.J. Roberts

The Planet of Youth • Stanton A. Coblentz • nv
Universe of Babel • John Edwards • ss
The Space Beings ["The Space Visitors"] • Edmond Hamilton • ss
The Chemical Brain • Francis Flagg • ss
The Time-Drug • Charles F. Hall • ss
When the Earth Tilted • J. M. Walsh • nv
The Ego of the Ant • Alfred Gordon Bennett, F.R.S.A. • ss
The Orbit Jumper • Geo. C. Wallis • nv

N° 6 - printemps 1939
Couverture de W.J. Roberts

The Mad Planet [*Burl] • Murray Leinster • na
The Thing in the Ice • W. P. Cockroft • ss
The Mentality Machine • S. P. Meek • ss
Voyage of Sacrifice ["The Great Sacrifice. A Scientific Romance"] • Geo. C. Wallis • ss T
Warning from Luna • Charnock Walsby • ss
The Alien Error • D. J. Foster • nv
The Gas-Weed • Stanton A. Coblentz • ss
The Inner World ["The Voice from the Inner World"] • A. Hyatt Verrill • 

N° 7 - été 1939
Couverture de Nick

The Venus Adventure [as by John Beynon Harris] • John Beynon • na
The Big Cloud • Coutts Brisbane • ss
City of Machines • Frank Edward Arnold • nv
The Yeast Men • David H. Keller, M.D. • nv
Creature of Eternity • Maurice G. Hugi • ss
Across the Abyss • Geo. C. Wallis • nv

N° 8 - automne 1939
Couverture de Nick

The Comet Doom • Edmond Hamilton • nv 
After a Million Years • J. M. Walsh • ss 
The Metal Man • Jack Williamson • ss 
The Island in the Air • D. J. Foster • nv
The Crystal Menace • Geo. C. Wallis • nv
World of Horror ["The Immeasurable Horror"] • Clark Ashton Smith • ss 
The Man Who Stopped the Dust • John Russell Fearn • nv

N° 9 - hiver 1939
Couverture de Caney

The Red Dust [*Burl] • Murray Leinster • nv
The Planet Wrecker ["Beyond the Orbit"] • Coutts Brisbane • ss
The Invisible City • Clark Ashton Smith • nv
The Men Without Shadows • Stanton A. Coblentz

N° 10 - printemps 1940
Couverture de W.J. Roberts

City of Singing Flame [*City of Singing Flame] • Clark Ashton Smith • nv
The Lunar Missile ["Ex Terra [Special!]"] • Coutts Brisbane • ss
The Man From Earth • John Beynon Harris • nv
Missionaries of Mars • Stanton A. Coblentz • ss
Worlds to Barter • John Beynon • nv

N° 11 - été 1940
Couverture de Turner

Invisible Monster [as by John Beynon Harris] • John Beynon • nv
The Man Who Saw the Future • Edmond Hamilton
Experiment in Genius • William F. Temple • na
Master of the Asteroid • Clark Ashton Smith • ss
Under the Dying Sun • Geo. C. Wallis • ss (r)
The Synthetic Entity • S. P. Meek • nv

N° 12 - automne 1940
Couverture de W.J. Roberts

Tyrant of the Red World • Richard Tooker • na
Machine-Man of Ardathia [*Ardathia] • Francis Flagg • ss
The Radio Telescope • Stanton A. Coblentz • nv
I, Spy! • Eric Frank Russell • nv

N° 14 - printemps 1941
Couverture ?

Death from the Skies • A. Hyatt Verrill • na
Murder in the Fourth Dimension • Clark Ashton Smith • ss
The Red Spheres  • Geo. C. Wallis • ss Child of Neptune ["A Baby on Neptune"] • Miles J. Breuer & Clare Winger Harris

N° 15 - automne 1941
Couverture ?

The Moon Era • Jack Williamson • na
The Cosmic Cloud • Geo. C. Wallis • ss Lady of the Atoms ["The Driving Power"] • Miles J. Breuer
The Insect World [*Eo, Reports to the Scientific Council] • Thos. S. Gardner • ss Escape to Mlok ["The Visitors from Mlok"] • Clark Ashton Smith

N° 16 - printemps 1942 (dernier numéro)
Couverture ?

The Earth Shall Die • Benson Herbert • nv
Breath of Utopia ["The Perfect Planet"] • Miles J. Breuer • ss
Beast of the Crater • Marion F. Eadie • ss
Flight Through Time ["Flight into Super-Time"] • Clark Ashton Smith • nv