R-T, Margaret, and the Rats of NIMH

R-T, Margaret, and the Rats of NIMH is a novel by Jane Leslie Conly, illustrated by Leonard Lubin. It is the sequel to Racso and the Rats of NIMH by the same author, which was in turn a sequel to Mrs. Frisby and the Rats of NIMH by her father Robert O'Brien.

R-T, Margaret, and the Rats of NIMH was first published in 1990, by Harper & Row, as a hardcover with the ISBN 0060213639.