In case you don’t want to spend hundreds of dollars and valuable search time finding an original 1909 Mares or the 1980’s Dan Post reprint, there’s now an Operation O.O.P.R.A.P. reprint of 1909 Mares in pocket paperback format: http://www.lulu.com/content/paperback-book/the-history-of-the-typewriter/26104091