More than twenty were runner-up for the annual Caldecott Medal from the children's librarians, which recognizes the year's "most distinguished American picture book for children".
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Ludwig Bemelmans, the creator of Madeline, once wrote to Massee explaining his attitude in writing a children's book: "We are writing for Children but not for Idiots".
Under the tutelage of May Massee of Viking Press, Angelo began writing children's stories in 1937.