O'Brien, Robert C. <br/><br/>
The secret of Nimh. 

 - New York :  Scholastic Inc.,  1971. 
 - 249 p. Lexile 780 700. 
<br/><br/> 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. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mice--Fiction.<br/>Rats--Fiction.
<br/><br/><label>LC Class. No.: </label>PZ10.3.O19  / Mi 
<br/><br/><label>Dewey Class. No.: </label>[Fic]