Contributors included Isaac Asimov, Robert A. Heinlein, Arthur C. Clarke, Poul Anderson, John Brunner, and James Blish.
[2] Planet Stories, a pulp sf magazine that focused on interplanetary adventure, was sufficiently successful to switch from quarterly to bimonthly in late 1950.
The publisher, Fiction House, also decided to launch a companion magazine, aimed more specifically at the growing readership for pocket books.
[3] This was Two Complete Science-Adventure Books; the first issue was dated Winter 1950, and it appeared three times a year on a regular schedule.
[7] Two Complete Science-Adventures Books outlasted Tops in Science Fiction by only a few months; it was cancelled in 1954, amid the collapse of the overall pulp market.
[4] Although the authors included names such as James Blish and Poul Anderson, much of the material was, in the words of sf historian Joseph Marchesani, "derivative space opera", particular the original novels.
[4] The original stories that appeared in the magazine included "The Wanton of Argus", an early story by John Brunner; "Seeker of the Sphinx", by Arthur C. Clarke; "Sword of Xota" and "Sargasso of Lost Cities", both by James Blish; and "The Tritonian Ring", by L. Sprague de Camp.
[4] Bixby included a column for readers' letters in the issues he edited, but Reiss and Daffron did not, and none of the three wrote editorials.