00806cam a2200217 4500 442924309 TxAuBib 20200101120000.0 921230s1971||||||||||||||||||||||||eng|u 9780689206511 0689206518 (OCoLC)27184640 VWB VWB OSS TxAuBib O'Brien, Robert C. Mrs. Frisby and the rats of NIMH / / Robert C. O'Brien ; illustrated by Zena Bernstein. New York : Atheneum, 1971. 233 p. : ill. ; 22 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. 20200101. Bernstein, Zena.