Astounding Stories of Super-Science, July 1930

Contains the following stories:
1. Beyond the Heaviside Layer-Capt. S.P. Meek
2. Earth, the Marauder-Arthur J. Burks
3. From an Amber Block-Tom Curry
4. The Terror of Air-Level Six-Harl Vincent
5. The Forgotten Planet-Sewell Peaslee Wright
6. The Power and the Glory-Charles W. Diffin
7. Murder Madness-Murray Leinster