Many people may remember him for his illustrations for another Margaret Wise Brown book - "The Golden Egg Book," about a bunny that wonders what is inside an egg.
Two underrated fantasies that he illustrated in the 1950s were the "The Snowflake and the Starfish" by Robert Nathan; it involves a sea-witch and two children, and "The Secret River" by Marjorie Kinnan Rawlings - that one got praised in Joan Lexau's 1968 classic "Striped Ice Cream."