Howard, W. J. <br/><br/>
Doing simple math in your head / 
W.J. Howard. 
 - Coos Bay, Ore. :  Coast Publishing,  1992. 
 - 190 p. 
<br/><br/><label>ISBN: </label>0962734152 
<br/><br/><label>LCCN: </label>92065183     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental arithmetic