NMLP P-026740 · True-first precedence · minted 2026-07-04

Beyond This Horizon

Robert A. Heinlein · Fantasy Press · 1948

US Fantasy Press hardcover is the true first in book form; the text was serialized earlier in Astounding (April and May 1942) under Heinlein's pseudonym Anson MacDonald.

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New Mexico Literacy Project — True-first precedence NMLP P-026740 for "Beyond This Horizon" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-026740, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).