A previously unknown Dr. Seuss book, titled "Sing the 50 United States!," has been published, marking the first full manuscript by the beloved author discovered in more than a decade. The book was found among Theodor Seuss Geisel's archives at UC San Diego's Geisel Library.
Cat Reynolds, executive editor for Dr. Seuss Publishing and Beginner Books, along with colleagues Alice Jonaitis and Sara Sargent, discovered the manuscript in the spring of 2025. The archives, described as "massive," contain approximately 20,000 items, including drawings, notes, and unfinished drafts.
"We were there looking for illustrations we could use for the 70th anniversary of ‘The Cat in the Hat’ and ‘The Grinch,’ which are in 2027," Reynolds told The Post. "The moment we realized this was a complete manuscript of something that was completely unknown, we were amazed… It was completely ready for publication — not even a punctuation mark needed to be changed."
The book features the Cat in the Hat and two Little Cat companions rhyming their way through all 50 states. Rough sketches and a book map left by Geisel guided the Random House team in creating the illustrations for the new release.
"This book is an example of his signature rhyme, joyful language, and imagination," Reynolds said. She also noted that the manuscript's distinctive rhythm and emphasis on musicality set it apart from other Dr. Seuss stories, reflecting the author's love for writing songs.
Random House has released one million copies of "Sing the 50 United States!," doubling its initial print run due to strong interest. "This book is a rare treasure, and we want to get it out to as many people as we can," Reynolds added.
Dr. Seuss, whose real name was Theodor Seuss Geisel, passed away in September 1991. His last posthumously released book, "What Pet Should I Get?," came out in 2015.