NMLP P-007230 · Point of issue · minted 2026-07-04

Hooray for Diffendoofer Day!

Dr. Seuss (with Jack Prelutsky & Lane Smith) · Alfred A. Knopf · 1998

First printing shows the Knopf full number line ending in 1 on the copyright page and the first-issue dust jacket with the original printed price

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New Mexico Literacy Project — Point of issue NMLP P-007230 for "Hooray for Diffendoofer Day!" by Dr. Seuss (with Jack Prelutsky & Lane Smith) (https://newmexicoliteracyproject.org/id/point/p-007230, CC BY 4.0, dataset DOI 10.5281/zenodo.21184548).