Robert A. Heinlein · Doubleday (hardcover) · 1956
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New Mexico Literacy Project — Point of issue NMLP P-026749 for "Double Star" by Robert A. Heinlein (https://newmexicoliteracyproject.org/id/point/p-026749, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).