Sawyer, W. W.  <br/><br/>
Vision in elementary mathematics 
W. W. Sawyer 
 - Mineola  Dover Publications  1964 
 - 346p. 
<br/><br/><label>ISBN: </label>9780486425559 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Mathematics--Study and teaching (Elementary)<br/>Mathematics--Study and teaching (Primary)
<br/><br/><label>Dewey Class. No.: </label>372.7 Sa975v