sentences: "Silverstein's cartoons appeared in issues of "Playboy" from 1957 through the mid-1970s, and one of his "Playboy" features was expanded into "Uncle Shelby's ABZ Book" (Simon & Schuster, 1961), his first book of new, original material for adults.Because it was unclear whether some of the material was intended for adults or children, the 1985 reprint had a conspicuous cover label.