Twain invented it, and contrary to some accounts it actually worked reasonably well and enjoyed steady sales past the turn of the century. Of course, after one-hundred years some unused pages will stick together if the thing is exposed to any humidity during a century of disuse. Largest size I've seen is 12 x 11 inches; smallest size I've seen fits in a shirt pocket. Bindings were usually cloth, often decorated, and sometimes 3/4 leather. Sometimes found in full leather with fancy gilding, but those are scarce. The pocket size format was bound in manilla card-wrappers. The best binding I've seen is one with a frog sitting on a toadstool (what else?) reading a book, similar to the image that appeared on the front wrapper of Twain's 1874 SKETCHES #1. It was also patented in England and France, and I have a variety of advertising pieces used to promote it in the US, France, and England --a cloth-bound catalogue; yellow, pink. and white paper leaflets of various sizes; accordion-fold leaflets; and even a blank notebook issued in France to advertise this scrapbook. It was also advertised on the endpapers of Twain's PUNCH BROTHERS PUNCH (1878). I have over 30 different examples of the scrapbook in various sizes and bindings. They are common, even in excellent condition. Kevin Mac Donnell Austin TX