It is indeed a creation of Sam Clemens, marketed in a number of different formats and covers, plain and sometimes quite elaborate, over a number of years. This invention actually made money for Clemens, perhaps having the byproduct of reinforcing his self-image as astute businessman, a delusion that would lead to disaster in the form of the Paige typesetter. Slote, Woodman & Co. was a New York Publisher and, if memory serves me, the publisher of the 1871 "Mark Twain's Autobiography and First Romance." (That's a paraphrasing of the actual title, a slim volume illustrated by Thomas Nast). The Self-Pasting Scrap Book is one of the more accessible pieces of Twain ephemera for collectors, often showing up in ebay auctions. Martin Zehr Kansas City, Missouri