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Many of his books were honoured by the American Library Association, including I Went to the Animal Fair: A Book of Animal Poems (named a notable book of 1958, and on the List of Notable Children's Books of 1940–1959), Beastly Boys and Ghastly Girls: Poems (named a notable book of 1964), and The Birds and Beasts Were There: Animal Poems (honoured in 1965).