NMLP P-037566 · True-first precedence · minted 2026-07-19
The Leavenworth Case
Anna Katharine Green · G. P. Putnam's Sons (New York) · 1878
US Putnam 1878 is the sole true first — the first bestselling American detective novel; there is no earlier or simultaneous UK edition (British printings came later). No UK-precedence question arises.
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New Mexico Literacy Project — True-first precedence NMLP P-037566 for "The Leavenworth Case" by Anna Katharine Green (https://newmexicoliteracyproject.org/id/point/p-037566, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).