Walker, Arthur L.  1899- <br/><br/>
How to use adding and calculating machines / 
Arthur L. Walker, J. Kenneth Roach, J. Marshall Hanna. 
 - 4th ed. 
 - New York :  Gregg Division, McGraw-Hill,  c1979. 
 - 218 p. :  ill. 
<br/><br/><label>ISBN: </label>0070678251 
<br/><br/><label>LCCN: </label>91035060     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculators--Problems, exercises, etc.