Worlds of If
by H. B. Fyfe, Milton Lesser, Arthur Dekker Savage, August Derleth, Alan Edward Nourse, James Blish, Jr. James McKimmey, Keith Laumer, Mari Wolf, Boyd Ellanby, Alvin Heiner, Don Berry, Mack Reynolds, Kenneth O'Hara, Dave Dryfoos, Jim Harmon, Mark Clifton, R. A. Lafferty, R. R. Winterbotham, Richard Wilson, Alex Apostolides, Alfred Coppel,
