NMLP P-026753 · True-first precedence · minted 2026-07-04

Double Star

Robert A. Heinlein · Doubleday (hardcover) · 1956

Caution: the Signet paperback and later printings are reprints, not the first. The Doubleday hardcover precedes all of them, and within the first printing the rear-panel 'The Long Tomorrow' / flap 'The Dragon in the Sea' advertisements mark the earliest state of the jacket.

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New Mexico Literacy Project — True-first precedence NMLP P-026753 for "Double Star" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-026753, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).