>I understand that one of Twain's daughters died as a young >woman. Did
>he write anything about this? I'd appreciate citations, as well >as any
>excerpt or paraphrase you can send me. Thanks.

Try "Papa: An Intimate Biography of Mark Twain by his thirteen-year-old
daughter, Susy,'' edited by Charles Neider. It's a very touching portrait
includes details of Susy's untimely death.