July 1931
From The Space Library
Hugo Gernsback publishes story “A Daring Trip to Mars” by rocket pioneer Max Valier in the July issue of Wonder Stories.
The Revolt of the Machines a science fiction story by American Interplanetary Society founder Nathaniel Schachner and Arthur Zagat appears in Astounding Stories magazine.
The Time Projector a science fiction story by American Interplanetary Society founder David Lasser appears in Hugo Gernsback's Thrilling Wonder Stories magazine.