Franklin W. Dixon <br/><br/>
The Disappearing floor 
Dixon, Franklin W. 
 - New York  Grosset & Dunlap  1992 
 - 176 
 - The Hardy Boys mystery stories .
<br/><br/><label>ISBN: </label>9780448089195 
<br/><br/><label>Dewey Class. No.: </label>823.0872  / DIX