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Shaun here - I run Letters of Note.

Presumably Vonnegut kept the draft, or kept the original and sent McCarthy the one copy. The letter's text was later included in Vonnegut's book, Palm Sunday, as mentioned on the site.

As an aside: thank you for the great web site.

Thank you. It's a pleasure.

Your site always makes my day. Keep the good work!

well, that's certainly disappointing.

He also wrote, "Do you have the courage and ordinary decency to show this letter to the people, or will it, too, be consigned to the fires of your furnace?"

The web site got the letter from a book that Vonnegut put together and published in 1981. Presumably he saved a copy himself, as many letter writers do.