Contributor biographical information for When? / by Leo Lionni ; text, Nora Lionni and Louis Mannie Lionni.

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LEO LIONNI wrote and illustrated more than 40 picture books, including four Caldecott Honor books--Inch by Inch, Swimmy, Frederick, and Alexander and the Wind-Up Mouse. He died in 1999 at the age of 89.]]

Library of Congress subject headings for this publication:
Mice -- Juvenile literature.
Time -- Juvenile literature.
Seasons -- Juvenile literature.
Board books.
Mice -- Fiction.
Animals -- Fiction.
Time -- Fiction.
Seasons -- Fiction.