NMLP P-019313 · True-first precedence · minted 2026-07-04

The Sword of Rhiannon (Sea-Kings of Mars)

Leigh Brackett · Ace Books (Ace Double D-36) · 1953

The magazine ('Sea-Kings of Mars,' 1949) is the first text appearance; the Ace Double D-36 is the first book edition (a paperback original). Later standalone Ace reprints are first-thus.

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New Mexico Literacy Project — True-first precedence NMLP P-019313 for "The Sword of Rhiannon (Sea-Kings of Mars)" by Leigh Brackett (https://newmexicoliteracyproject.org/id/point/p-019313, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).