Growth in mathematics :  purple / 
David W. Wells ... [et al.] 
 - New York :  Harcourt Brace Jovanovich,  1978 
 - ix, 358 p. :  ill ;  24 cm. 
<br/><br/> Index. 
<br/><br/><label>ISBN: </label>0153512814 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching (Elementary)--Juvenile literature