Trachtenberg speed system of basic mathematics 

 - London  Pan Books  1962 # 1978 
 - 255  Pb  18cm 
<br/><br/><label>ISBN: </label>0-330-23086-7 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>510.2