The Colors of Space
Marion Zimmer Bradley
Discover stories
New worlds on MoonQuill Library — complete escapes, chapter by chapter.
Triplanetary
E. E. (Edward Elmer) Smith
A Martian Odyssey
Stanley G. (Stanley Grauman) Weinbaum
The Undersea Tube
L. Taylor (Lucile Taylor) Hansen
Astounding Stories, May, 1931
Various
Brood of the Dark Moon: (A Sequel to “Dark Moon”)
Charles Willard Diffin
Astounding Stories, June, 1931
Various
On the Trail of the Space Pirates
Carey Rockwell
The Secret of the Ninth Planet
Donald A. Wollheim