NMLP P-027916 · True-first precedence · minted 2026-07-04

To Open the Sky

Robert Silverberg · Ballantine · 1967

US Ballantine paperback original is the true first; there was no prior hardcover.

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New Mexico Literacy Project — True-first precedence NMLP P-027916 for "To Open the Sky" by Robert Silverberg (https://newmexicoliteracyproject.org/id/point/p-027916, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).