New York: Quinn Publishing. "If" Worlds of Science Fiction. Octavo, all in original colour illustrated wraps, b&w illus, var. pag. US printings: November 1960, January 1961, March 1961, May 1961, July 1961, September 1961, November 1961, January 1962, March 1962, May 1962, July 1962, September 1962, November 1962, January 1963.....