NMLP P-042095 · True-first precedence · minted 2026-07-19

Sixth Column

Robert A. Heinlein · Gnome Press (New York) · 1949

US first; no UK hardcover precedes it, and this is the first book appearance in any market. The text was serialized in Astounding Science Fiction across January–March 1941 under Heinlein's pseudonym "Anson MacDonald," so the Gnome Press hardcover is the first appearance under Heinlein's own name but not the first appearance of the text.

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New Mexico Literacy Project — True-first precedence NMLP P-042095 for "Sixth Column" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-042095, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).