Williams, K R <br/><br/>
Natural Calculator   Using the Natural Process of the Mind for Mental Calculation 

 - Delhi  Motilal Banarsidass Publishers Pvt Ltd  2003 
 - 85p 
<br/><br/> includes index and biblioraphy 
<br/><br/><label>ISBN: </label>8120819624     130 
<br/><br/><label>Dewey Class. No.: </label>S12  / W670