Keene, Carolyn. The message in the hollow oak / by Carolyn Keene - New York : Grosset & Dunlop, 1993. - 181 p. ; 19 cm. - Nancy Drew mystery stories . ISBN: 0448095122 Subjects--Topical Terms: Detective and mystery stories--Juvenile fiction. Dewey Class. No.: 813.5 / KEE 1993