Gutenberg Project is full of Twain.  I think it has all that the Oxford
Mark Twain contains (sans commentary).

On Tue, 2011-09-27 at 17:44 -0700, Arianne wrote:
> ONe of our local libraries has a new special printer and intends to print up
> a small sampler to demonstrate what it can do.   I was asked if I knew
> if a story of his was in public domain or if one had to ask permission of
> the Mark Twain Papers.  (Story was "How to Write a Story")  I have no
> idea!  Could any of you experts tell me the answer to pass on?
> 
> THANKS
> Arianne Laidlaw