Hildick, E. W.  1925- <br/><br/>
The case of the invisible dog :  a McGurk mystery /  [electronic resource]  
by E.W. Hildick ; illustrated by Lisl Weil. 
 - New York :  Pocket Books,  1978. 
 - 119 p. :  ill. ;  18 cm. 
<br/><br/> The McGurk Organization's four young detectives match wits with a nine-year-old scientific genius to unravel the mystery of the "invisible dog". 
<br/><br/><label>ISBN: </label>0671298917 9780671298913 
<br/><br/><label>LCCN: </label>77004466