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New Mexico Literacy Project — Point of issue NMLP P-040144 for "Relativity: The Special and the General Theory (Über die spezielle und die allgemeine Relativitätstheorie)" by Albert Einstein (https://newmexicoliteracyproject.org/id/point/p-040144, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).