NMLP P-026913 · True-first precedence · minted 2026-07-04

Tunnel in the Sky

Robert A. Heinlein · Charles Scribner's Sons · 1955

US Scribner's first, part of the Scribner Heinlein juvenile series.

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New Mexico Literacy Project — True-first precedence NMLP P-026913 for "Tunnel in the Sky" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-026913, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).