I've been hearing talk of the release of an unexpurgated autobiography by Mark Twain for a while. According to the NYT article I just sent you to, earlier editions were published in 1924, 1940, and 1959. I'm guessing it was the 1959 edition that I read when I was in eighth grade for an English assignment. I remember little about it except that after I finished I told my mother that if Twain were still alive, I would write him a letter.
I was very disappointed when I couldn't find it for my kids to read.