TRACHTENBERG <br/><br/>
The trachtenberg speed system of basic mathematics 

 - Calcutta  Rupa pub.  1992 
 - 270 p. 
<br/><br/><label>ISBN: </label>168967 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental arithmetric
<br/><br/><label>Dewey Class. No.: </label>613.9  / TRA