More Penguin science fiction

The Monkey Wrench - short story by Gordon R. Dickson The First Men - novelette by Howard Fast Counterfeit - novelette by Alan E. Nourse The Greater Thing - novelette by Tom Godwin Build Up Logically - short story by Howard Schoenfeld (variant of Built Up Logically 1949) The Liberation of Earth - short story by William Tenn An Alien Agony - short story by Harry Harrison (variant of The Streets of Ashkelon) The Tunnel Under the World - novelette by Frederik Pohl The Store of the Worlds - short story by Robert Sheckley Jokester - short story by Isaac Asimov Pyramid - novelette by Robert Abernathy The Forgotten Enemy - short story by Arthur C. Clarke