Singer, Marilyn. <br/><br/>
A clue in code / 
Marilyn Singer ; illustrated by Judy Glasser. 
 - New York :  Harper,  1985. 
 - 52 p. :  ill. 
 - A Sam and Dave mystery story .
<br/><br/> When money for the class trip suddenly disappears, detective twins Sam and Dave Bean get on the case. 
<br/><br/><label>ISBN: </label>0060256370 (lib. bdg.) :  $8.89 0060256346 :  $8.95 
<br/><br/><label>LCCN: </label>84048335 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Twins--Fiction.<br/>Mystery fiction.
<br/><br/><label>Dewey Class. No.: </label>Fic