Can't speak to the best or most complete collection of Twain's talks, but one very useful such collection, edited by Paul Fatout, is "Mark Twain Speaking", published in 1976 by the University of Iowa Press, Iowa City 52242. It includes some "previously unpublished" material, and a 13 pg introductory text which discusses his speaking style and speaking experience. The University of California's Melvyl catalog shows another possibly useful source, hopefully available on interlibrary loan. 1. DISSERTATION Donner, Stanley T., 1910- The speaking and reading of Mark Twain.. 1946. UCB Main MICROFILM.15487.PS v. 1-2 (1946)