Mark Twain himself is as often a subject for research and discussion as are his works. However, there are few full-length bibliographies to date, and the definitive study of Twain's life is yet to be written. The history of scholarship devoted to Twain's life and work is long and rich and offers material that covers nearly every facet of the life of this popular American writer. But while much biographical matter exists, little can be found in the way of an organized guide to it. Mark Twain: A Descriptive Guide to Biographical Sources fills this gap, providing an annotated guide to the wealth of biographical sources focusing on the life of Mark Twain. The guide encompasses all types of biographical material: general studies and indexes, standard and other notable biographies, autobiography, letters, journals, critical studies, and the most useful of those books and articles that significantly add to our knowledge of Mark Twain. The most recent sources are considered.