How does it work ? :   question and answer encyclopedia 

 - Firth, Lesley 
 - 127 pages :   colour illustrations ;   28 cm 
<br/><br/><label>ISBN: </label>0862720729 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science - Dictionaries - Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>032