Astounding Stories 17, May 1931 - Undefined

This issue of the science-fiction magazine includes a novella by Charles W. Diffin titled "Dark Moon" and several short stories, including "When Caverns Yawned", by Captain S.P. Meek "When the Moon Turned Green", by Hal K. Wells and "The Death-Cloud." by Nat Schachner & Arthur L. Zagat There is also a second part of "The Exile of Time" by Ray Cummings. - Summary by Bill Boerst