"by Franklin W. Dixon" <br/><br/>
The Disappearing Floor - 11d 

 -  New York : Grosset & Dunlap, c1964.  2002 
 - 176 
<br/><br/><label>ISBN: </label>9780448089195 
<br/><br/><label>Dewey Class. No.: </label>F823  / 0002173