Dr. Seuss · Random House (Beginner Books) · 1963
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New Mexico Literacy Project — True-first precedence NMLP P-007035 for "Hop on Pop" by Dr. Seuss (https://newmexicoliteracyproject.org/id/point/p-007035, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).