Yesterday's Tomorrows

Isaac Asimov, Robert Sheckley, Cordwainer Smith, Philip K. Dick, Harlan Ellison, Fritz Leiber, Ross Rocklynne, Robert Silverberg, R. A. Lafferty, Horace L. Gold, Cyril M. Kornbluth, James Blish, Jack Vance, James Tiptree, Jr., Donald A. Wollheim, David A. Kyle, Samuel R. Delany, Larry Niven, Jerome Bixby, A. E. van Vogt, Leigh Brackett, Paul R. Ehrlich, Gustav Hasford, Mack Reynolds, Wilson Bob Tucker, Fred Saberhagen, Robert A. Heinlein, Lester del Rey, Roger Zelazny, Arthur C. Clarke, Frederik Pohl, Kurt Vonnegut, Jack Williamson