Robert Silverberg and Clifford D. Simak Short Stories - 14 Science Fiction Short Stories Six Frightened Men by Robert Silverberg Planet of the Angry Giants by Robert Silverberg Rescue Mission by Robert Silverberg The Inquisitor by Robert Silverberg Monsters That Once Were Men by Robert Silverberg The Guest Rites by Robert Silverberg Hero From Yesterday by Robert Silverberg The Thing Behind Hell's Door by Robert Silverberg Never Trust a Thief! by Robert Silverberg Second Childhood by Clifford D. Simak Message From Mars by Clifford D. Simak The Call From Beyond by Clifford D. Simak The World That Couldn't Be by Clifford D. Simak The Shipshape Miracle by Clifford D. Simak