Mark Twain's letters to his publishers, 1867-1894
Mark Twain, Hamlin Lewis Hill (Editor, Writer of introduction), Roy J. Friedman Mark Twain Collection (Library of Congress)
290 letters, not previously published, charting the matters concerning publication of the author's books from 1867 through 1894
Print Book, English, 1967
University of California Press, Berkeley, 1967