There being some kind of cosmic rule that I am only given subjects to write on, about which I know nothing, would the members of this forum be so kind as to recommend those biographical works essential to understanding Twain? I've only got three at hand: Rasmussen's Facts-on-File one-volume /Mark Twain A to Z/; Kaplan's biography, and Emerson's /Mark Twain: A Literary Life/. I'm looking for sources that are as detailed, and specific , as possible. Another question, please: other than the Mark Twain Letters & Project, what other on-line sources might be helpful? My emphasis, God help us, is biographical, as compared to say, literary. Thank you! Cordially, Sara