# Is "Hooray for Diffendoofer Day!" by Dr. Seuss (with Jack Prelutsky & Lane Smith) a First Edition?

> **Quick answer.** A first edition of Hooray for Diffendoofer Day! by Dr. Seuss (with Jack Prelutsky & Lane Smith) (Alfred A. Knopf, 1998) is identified by: Seuss fragment completed by Jack Prelutsky and illustrated by Lane Smith, with an editor's introduction and reproductions of Seuss's original sketches. US Alfred A.

**Checklist — a true first has these:**
- Seuss fragment completed by Jack Prelutsky and illustrated by Lane Smith, with an editor's introduction and reproductions of Seuss's original sketches
- 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
- Publisher imprint reads Alfred A. Knopf
- Not a book-club edition (see below)

| | |
|---|---|
| Author | Dr. Seuss (with Jack Prelutsky & Lane Smith) |
| Publisher | Alfred A. Knopf |
| Year | 1998 |
| True first | US edition |
| Format | Children's / illustrated |
| Key point | Seuss fragment completed by Jack Prelutsky and illustrated by Lane Smith, with an… |
| Book-club edition exists? | Yes |

## Points of issue
Seuss fragment completed by Jack Prelutsky and illustrated by Lane Smith, with an editor's introduction and reproductions of Seuss's original sketches. 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.

## Is this the true first?
US Alfred A. Knopf first (1998); posthumous completion of an unfinished Seuss project.

## Telling it from reprints & book-club editions
Book-club editions typically lack a printed jacket price and may not carry the full number line.

## Source
New Mexico Literacy Project — Is *Hooray for Diffendoofer Day!* by Dr. Seuss (with Jack Prelutsky & Lane Smith) a first edition? https://newmexicoliteracyproject.org/first-edition/hooray-for-diffendoofer-day
CC BY 4.0. Part of the Canonical First-Edition Points of Issue dataset (https://newmexicoliteracyproject.org/api/first-edition-titles.json). Last reviewed 2026-07-03.