Greenburg, Dan <br/><br/>
Great-grandpa's in the litter box ; Through the medicine cabinet 
/ by Dan Greenburg ; illustrated by Jack E. Davis 
 - New York :  Grosset & Dunlap,  1996 
 - 59, 57 pages :  illustrations 
 - The Zack files .
<br/><br/> Contains the first two Zack files novels. 
<br/><br/><label>ISBN: </label>0448428253 
<br/><br/><label>Dewey Class. No.: </label>Fic