Washington, Allyn J. <br/><br/>
Mathematics :  a development approach / 
Allyn J. Washington 
 - California :  R.D. Opie ,  1972 
 - ix, 306p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>510  / WAS