Astounding Science Fiction: March 1956 Robert A. Heinlein, Double Star (Part two of three parts) See also: Emsh’s cover Frank Kelly Freas’ interior illustrations (Minor Ingredient) H. R. Van Dongen’s interior illustrations (Man In the Sky) H. R. Van Dongen’s interior illustrations (A Nice Little Niche) Correlation of the Martian Canal Network The Viking Rocket Story (advertisement)