NMLP P-019961 · True-first precedence · minted 2026-07-04

Showdown at Yellow Butte (as Jim Mayo)

Louis L'Amour · Ace Books · 1953

True first US in book form; an early pseudonymous Ace Double paperback original, later absorbed into the collected L'Amour canon under his own name.

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New Mexico Literacy Project — True-first precedence NMLP P-019961 for "Showdown at Yellow Butte (as Jim Mayo)" by Louis L'Amour (https://newmexicoliteracyproject.org/id/point/p-019961, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).