"Carolyn Keene" <br/><br/>
The Clue of the Black keys - 12a 

 -  ,New York : Grosset & Dunlap, c1968.  2000 
 - 174 
<br/><br/><label>ISBN: </label>9780448095288 
<br/><br/><label>Dewey Class. No.: </label>F823  / 0002122