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by Larry Niven, Jack Vance, Isaac Asimov, and 13 others
by Harry Harrison, Poul Anderson, Robert Silverberg (non valido), and 16 others
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![Harry Harrison, Poul Anderson, Robert Silverberg (non valido), Orson Scott Card, Martin H. Greenberg, Edward Wellen, Harry Turtledove, Robert Sheckley, Connie Willis, Pamela Sargent, George Alec Effinger, Mike Resnick, Barry N. Malzberg, Sheila Finch, Frederik Pohl, George Zebrowski, Edward D. Hoch, Hal Clement, Martin H. (edited by) [prefaces by Ray Bradbury and Ben Bova] [afterw Greenberg: Foundation's Friends (Hardcover, 1989, Tor)](https://grimoire-social.us-sea-1.linodeobjects.com/images/thumbnails/covers/2a310c9b-9396-405d-964b-eb709ce32718/f357a0a482c710c1e21ffedd5e15e150.webp)