August 1931
From The Space Library
Article "Harnessing Giant Rockets" by G. Edward Pendray appears in Popular Science magazine.
"Exploring the Moon by Rocket Ship" by Robert Esnault-Pelterie appears in Modern Mechanics magazine.
Issue #11 of the Bulletin of the American Interplanetary Society is published, it includes an announcement about a book by David Lasser about to be published called The Conquest of Space.