Frank R. Paul. The Reign of the Ray, The Skylark of Space, Beyond Pluto, The Flying Buzzsaw, Beyond the Aurora, Evans of the Earth Guard, The Jovian Horde, The Wonders of Gravitation, Subterranean Adventure, The Menace from Below. 1930s.
Hans W. Wessolowski. Salvage in Space (detail). 1934.
Howard V. Brown. Galactic Patrol. 1937.
Howard V. Brown, Astounding Stories (H.P. Lovecraft), 1936.
Source: spacerubbish.wordpress.com