MIRROR. [New York]: Fortune, May 1962. Large folio, 33x52 cm., single sheet, folded to 26x16.5 cm., printed on both sides. First edition. An offprint of this story published in the April 1962 issue of SCIENTIFIC AMERICAN and the May 1962 issue of FORTUNE as an advertisement for Hoffman Electronics Corporation. Just a bit wrinkled, else a fine copy. (#159206).