Dear Sally,

This will seem like ancient history, probably, but Professor Daniel M.
McKeithan of the University of Texas at Austin published a book in 1958
titled COURT-TRIALS IN MARK TWAIN AND OTHER ESSAYS (The Hague:  Martinus
Nijhoff).  He tried to cover the most significant examples of Twain's
interest in the administration of justice.

Herbert Feinstein wrote an article on Twain copyright battles--"Mark Twain &
the Pirates," HARVARD LAW SCHOOL BULLETIN 13 (April 1962): 6-18.

These are a start, anyway.

Sincerely,

Alan Gribben
Auburn University Montgomery