Clark, John R. <br/><br/>
Growth in arthmetic, grade seven /  
John R.Clark...[et al] 
 - Yonkers  :    World Book Company,    1952 
 - v, 314 :    ill. ;    23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Arithmetic -- Study and Teaching  (Primary)<br/> Mothematical Ability.
<br/><br/><label>Dewey Class. No.: </label>372.72 CLA