Does anyone know of a fairly comprehensive, Chronological list of writings
by Twain?  I would be especially interested in one based on when the piece
was written, not published.

I seem to recall one out there somewhere but now I cannot locate.  PS--a
very good and brief chronological biographical treatment, which contains
many publishing dates, is in Louis Budd's Library of America edition of the
tales and speeches et al.

Harold K. Bush, Jr.
Saint Louis University