Who Is Mark Twain?, by Mark Twain, is free in the Kindle store, down from $9.99 last month. No doubt the individual stories are in the public domain, but this collection from Harper-Collins should be well done.
Book Description
Who Is Mark Twain? is a collection of twenty six wickedly funny, thought-provoking essays by Samuel Langhorne Clemens—aka Mark Twain—none of which have ever been published before, and all of which are completely contemporary, amazingly relevant, and gut-bustingly hilarious.
Also free in the Sony store.