Number 1 edit
April 1930
Cover art by Leo Morey
- The Metal Horde [Stephen Waterson] • John W. Campbell • novelette
- Remote Control • Walter Kateley • novelette
- The Feathered Detective • A. Hyatt Verrill • novelette
- The Conquest of the Earth • Isaac R. Nathanson • novelette
- Rhythm • Charles Cloukey • short story
- The Green Girl [Part 2 of 2] • Jack Williamson • novella
Number 2 edit
May 1930
Cover art by Leo Morey
- The Universe Wreckers [Part 1 of 3] • Edmond Hamilton • novel
- Oh, Ye Fourth Dimension • Albert Sidney? • poem
- Synthetic • Charles Cloukey • novelette
- Vis Scientiæ • Miles J. Breuer • poem
- The Gimlet • Victor A. Endersby • novelette
- The Noise Killer • A. M. McNeill • short story
- Madness of the Dust • R. F. Starzl • short story
- The Ivy War • David H. Keller • novelette
- A Circe of Science • Stanton A. Coblentz • short story
- Through the Veil • Leslie F. Stone • short story
- The Pea Vine Mystery • A. L. Hodges • vignette
- The Dead Sailor • A. L. Hodges • vignette
Number 3 edit
June 1930
Cover art by Leo Morey
- The Non-Gravitational Vortex • A. Hyatt Verrill • novella
- Element 87 • Ralph Linn • short story
- Piracy Preferred [Arcot, Wade & Morey] • John W. Campbell • novella
- The Universe Wreckers [Part 2 of 3] • Edmond Hamilton • novel
Number 4 edit
July 1930
Cover art by Leo Morey
- A Visit to Suari • A. Hyatt Verrill • novelette
- The Driving Power • Miles J. Breuer • short story
- Paradox+ [Paradox] • Charles Cloukey • novelette
- Flamingo (A Drama of A.D. 1950) • Clarence Edward Heller • short story
- The Message from Space • David M. Speaker • novelette
- The Universe Wreckers [Part 3 of 3] • Edmond Hamilton • novel
Number 5 edit
August 1930
Cover art by Wesso
- Skylark Three [Part 1 of 3; Skylark] • Edward E. Smith • novel
- The Mystery of Professor Brown • A. L. Hodges • vignette
- South Polar Beryllium, Limited • Peter van Dresser • novelette
- World Atavism • Edmond Hamilton • novelette
- The Last War [Nashky] • Capt. S. P. Meek • novella
- When Inca-Land Revolted • Woods Peters • novelette
Number 6 edit
September 1930
Cover art by Leo Morey
- The Troglodytes • Fred M. Barclay • novella
- The Passing Star • Isaac R. Nathanson • novelette
- The Translation of John Forsythe • Edmund W. Putnam • novelette
- Free Energy • Harl Vincent • short story
- The Inferiority Complex • Miles J. Breuer • short story
- Skylark Three [Part 2 of 3; Skylark] • Edward E. Smith • novel
Number 7 edit
October 1930
Cover art by Leo Morey
- The Prince of Liars • L. Taylor Hansen • novelette
- Sonnet • Albert Sidney • poem
- The Man Who Saw the Future • Edmond Hamilton • short story
- Skylark Three [Part 3 of 3; Skylark] • Edward E. Smith • novel
- The Dynasty of the Blue-Black Rays • Milton R. Peril • novelette
- The Man from the Moon • Otis Adelbert Kline • novelette
- Written in the Year 2100 • Charles Ward • short story
Number 8 edit
November 1930
Cover art by Leo Morey
- The Drums of Tapajos [Part 1 of 3; Duncan, Mariston, Nankivell, Willis] • Capt. S. P. Meek • novel
- The Globoid Terror • R. F. Starzl • short story
- Solarite [Arcot, Wade & Morey] • John W. Campbell • novella
- The Pineal Stimulator • I. M. Stephens & Fletcher Pratt • short story
- Missionaries from the Sky • Stanton A. Coblentz • short story
- The Cosmic Express • Jack Williamson • short story
Number 9 edit
December 1930
Cover art by Leo Morey
- The Eclipse Special • William Lemkin • novella
- The Second Missile [Brandon] • Ed Earl Repp • novella
- The Drums of Tapajos [Part 2 of 3; Duncan, Mariston, Nankivell, Willis] • Capt. S. P. Meek • novel
- Anachronism [Paradox] • Charles Cloukey • novelette
- Reaping the Whirlwind • Alfred I. Tooke • short story
- Sonnet to Science • Miles J. Breuer • poem
Number 10 edit
January 1931
Cover art by Leo Morey
- The Prince of Space • Jack Williamson • novella
- Tanks Under the Sea • Harl Vincent • novelette
- The Black Hand • Charles Gardner Bowers • short story
- Via the Time Accelerator • Frank J. Bridge • novelette
- The Drums of Tapajos [Part 3 of 3; Duncan, Mariston, Nankivell, Willis] • Capt. S. P. Meek • novel
- The Act of Retipuj • Samuel Garfinkel • short story
Number 11 edit
February 1931
Cover art by Leo Morey
- Television Hill [Part 1 of 2] • George McLociard • novel
- The Bees from Borneo • Will H. Gray • short story
- The Purple Plague • Russell Hays • novella
- The Exterminator • A. Hyatt Verrill • short story
- Twenty Years from Today • W. F. Collins • vignette
- The Man Who Annexed the Moon • Bob Olsen • novelette
Number 12 edit
March 1931
Cover art by Leo Morey
- The Valley of Titans • Lloyd Arthur Eshbach • novella
- On Board the Martian Liner • Miles J. Breuer • novelette
- Television Hill [Part 2 of 2] • George McLociard • novel
- The Earth's Cancer [Dr. Bird] • Capt. S. P. Meek • novelette
- The Thing That Walked in the Rain • Otis Adelbert Kline • novelette
- The Evolution of an Ace • Julia Boynton Green • poem
- The Doctor's Experiment • Allan Strathglass • short story