I have a signed letter from sam l clemens talking about the story of huckleberry finn how much $ can i get.?

Question

my mom found this a her mom's house

Answer 1

you'll need someone to authenticate it first.
Check these sites

http://www.library.ucsb.edu/speccoll/rare.html

http://bancroft.berkeley.edu/MTP/twcorrdesc.html

http://www.columbia.edu/cu/news/02/04/markTwain.html

http://www.twainweb.net/reviews/uclc.html