Trachtenberg speed system of basic mathematics 

 - New Delhi  Rupa & Company  2001 # 1960 
 - 270  Pb 
<br/><br/><label>ISBN: </label>0-285-62916-6 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>510