Someone sent me a page from a British newspaper - The Sunday Times, 18
June, 95 - with an article about Twain, and it has a picture of him at
about the age you want. If you have no luck finding one elsewhere, I can
scan it and send it to you.
I haven't read the article yet, but it seems to be about Huck Finn and
gold. I wonder if I would be in breach of copyright if I posted it here.
Perhaps a synopsis would be better.