Darker Than You Think

US original and the true first book edition; the census claim is correct. It expands the novella of the same title from Unknown (December 1940) to novel length, so the magazine text is the only prior appearance and is not a book edition. No earlier or competing British edition is documented in the sources consulted — first British publication is later — so there is no UK-vs-US precedence question. New Mexico author (Portales).