NMLP P-026840 · Point of issue · minted 2026-07-04

The Door into Summer

Robert A. Heinlein · Doubleday & Company, Garden City, NY · 1957

Time-travel and suspended-animation novel, preceded only by the 1956 magazine serialization

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New Mexico Literacy Project — Point of issue NMLP P-026840 for "The Door into Summer" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-026840, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).