NMLP P-020121 · True-first precedence · minted 2026-07-04

Utah Blaine (as Jim Mayo)

Louis L'Amour · Ace Books · 1954

True first US edition; a pseudonymous Ace Double paperback original of 1954. The novel later appeared under L'Amour's own name in reprint, but the D-48 'Jim Mayo' Ace Double is the first appearance in book form.

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New Mexico Literacy Project — True-first precedence NMLP P-020121 for "Utah Blaine (as Jim Mayo)" by Louis L'Amour (https://newmexicoliteracyproject.org/id/point/p-020121, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).