Letter (Elmira, New York, August 20, 1877): from Samuel L. Clemens (Mark Twain) to Francis D. Clark sending his regrets that
he cannot accept the invitation from the Society of California Pioneers (in New York), due to other engagements.
Mark Twain is very well known, and further biographical information can be found through other resources. Information on Mark
Twain's time in California taken from A Companion to California by James D. Hart: