Yesterday's Tomorrows

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