The World Turned Upside Down - Robert A. Heinlein, Arthur C. Clarke, Isaac Asimov, L. Sprague de Camp, Robert Sheckley, Eric Flint, David Drake, Fritz Leiber, James H. Schmitz, Jim Baen, Poul Anderson, Theodore Sturgeon, Jack Vance, Fredric Brown, A.E. van Vogt, Ross Rocklynne, C.M. Kornbluth, C.L. Moo