Mark Twain, by D. Wecter.--My Mark Twain, by W. D. Howells.--Mark Twain's despair, by V. W. Brooks.--The symbols of despair, by B. DeVoto.--Mark Twain: an unsentimental journey, by D. MacDonald.--Huck and Jim, by K. S. Lynn.--Duplicitous Mark Twain, by L. A. Fiedler. --Hannibal and the bones of art, by W. T. Scott.--Mark Twain's nom de plume, by P. Fatout.--The California bull and the gracious singers, by H. N. Smith.--The muse of Samuel Clemens, by J. M. Cox.--The Yankee and the machine: Mark Twain's perfectible world, by J. Kaplan.--Selected bibliography (p. 229-230).