Sawyer, W. W. <br/><br/>
Vision in elementary mathematics 
W.W. Sawyer. 
 - Dover ed. 
 - Mineola, N.Y.  Dover Publications  2003. 
 - 346 p.  ill.  22 cm. 
<br/><br/> Originally published: Harmondsworth, Middlesex, England ; Baltimore, Md. : Penguin Books, 1964, in series: Introducing mathematics ; 1. 
<br/><br/><label>ISBN: </label>048642555X (pbk.) 
<br/><br/><label>LCCN: </label>2002034825 
<br/><br/><label>Nat. Bib. No.: </label>GBA2-U5557 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>QA135.6  / .S39 2003 
<br/><br/><label>Dewey Class. No.: </label>372.7  / S2716v