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Random House is calling it “the literary equivalent of buried treasure.” This September, the company will release The Bippolo Seed and Other Lost Stories by Dr. Seuss, containing seven rarely-before-seen stories from the children’s lit virtuoso.

Massachusetts dentist (and Seussophile) Dr. Charles Cohen had listed original Seuss magazine prints on eBay when Theodor “Seuss” Geisel’s art director happened upon them. After meeting with Cohen in person, they decided to run the cartoons with enhanced color in the upcoming 72-page book.

Bippolo Seed hits bookstores nearly 13 years after Geisel’s previous posthumous release, and 20 years after his death. His nom de plume Dr. Seuss is, of course, synonymous with rhyming whimsy and odd, fanciful characters, and he helped define early childhoods all over the world. Seuss’s writing and illustrations have long reigned as a media empire, with TV shows, merchandising, games, and films. A movie based on The Lorax is set for release next March.