Astounding Stories (Vol. VI No. 2 May, 1931); pulp science fiction and horror.In this issue:DARK MOON CHARLES W. DIFFINMysterious, Dark, Out of the Unknown Deep Comes a New Satellite to Lure Three Courageous Earthlings on to Strange Adventure. (A Complete Novelette.) WHEN CAVERNS YAWNED CAPTAIN S. P. MEEKOnly Dr. Bird's Super-Scientific Sleuthing Stands in the Way of Ivan Sarnoff's Latest Attempt at Wholesale Destruction.THE EXILE OF TIME RAY CUMMINGSYoung Lovers of Three Eras Are Swept down the Torrent of the Sinister Cripple Tugh's Frightful Vengeance. (Part Two of a Four-Part Novel.) WHEN THE MOON TURNED GREEN HAL K. WELLSOutside His Laboratory Bruce Dixon Finds a World of Living Dead Men-and Above, in the Sky, Shines a Weird Green Moon.THE DEATH-CLOUD NAT SCHACHNER AND ARTHUR L. ZAGATThe Epic Exploit of One Who Worked in the Dark and Alone, Behind the Enemy Lines, in the Great Last War.