AUTHORS: In 1937, this author's sister said he had “hats of every description,” which he would use as a “foundation of his next book.”

Theodor Seuss Geisel, better known under his pen name Dr. Seuss, was a prolific author of children's books, selling more than 600 million copies worldwide. His sister, Marnie Geisel, commented that he had “hats of every description,” which he would use as a “foundation of his next book” in 1937. That book introduced us to a famous cat.

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