The Celebrated Jumping Frog of Calaveras County, and Other Sketches

Confirmed: the C. H. Webb, New York, 1867 edition is the true first and the head of the Twain canon. There is no competing UK original — George Routledge & Sons, London, 1867 is a piracy that reprints the Webb text and was the first British appearance, and Hotten in turn reprinted the Routledge text in 1870; Routledge reprinted again in 1870 and reissued in 1872. Per the Mark Twain Project, none of the pirated texts was revised by the author, though their compositors introduced errors. A London 1867 Routledge is therefore an unauthorised reprint, not a co-first.