Darby, Gene. What is a fish / Pictured Lucy and John Hawkinson. - Chicago : Benefic Press, 1958. - 48 p. : ills. ; 20 cm. - The What is it series . 323 323 LCCN: 58002824 Subjects--Topical Terms: Readers--Animals. Dewey Class. No.: 372.4 / D242w