NMLP P-027881 · True-first precedence · minted 2026-07-04

The 13th Immortal

Robert Silverberg · Ace · 1957

US Ace Double paperback original is the true first; this is Silverberg's first novel in book form, appearing only in this Ace Double with no separate hardcover first.

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New Mexico Literacy Project — True-first precedence NMLP P-027881 for "The 13th Immortal" by Robert Silverberg (https://newmexicoliteracyproject.org/id/point/p-027881, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).