O'Brien, Robert C.

Mrs. Frisby and the rats of Nimh / [by] Robert C. O'Brien ; illustrated by Zena Bernstein. - New York : Atheneum, 1978, c1971. - 233 p. : illus. ; 20 cm.

Having no one to help her with her problems, a widowed mouse visits the rats whose former imprisonment in a laboratory made them wise and long lived.

ISBN: 0689821719

LCCN: 74134818 /AC