Swain, Robert L. <br/><br/>
Understanding arithmetic. 

 - New York  Rinehart  [1957] 
 - xxi, 264 p.  illus., diagrs.  24 cm. 
<br/><br/><label>LCCN: </label>57006454 //r84 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept.<br/>Arithmetic--Study and teaching.<br/>Arithmetic--Foundations.
<br/><br/><label>LC Class. No.: </label>QA142  / .S9 
<br/><br/><label>Dewey Class. No.: </label>511