Claim: The Castle of Iron is an English fantasy novel written by L. Sprague de Camp and Fletcher Pratt, who also wrote The Well of the Unicorn, and was published by a small-press publishing company in New York.
Evidence: English The Well of the Unicorn is a fantasy novel by the American writer Fletcher Pratt. Gnome Press Gnome Press was an American small-press publishing company primarily known for publishing many science fiction classics. New York City L. Sprague de Camp and Fletcher Pratt Fantasy