Walker, Arthur L.  1899- <br/><br/>
How to use adding and calculating machines :  full-keyboard adding machine, ten-key adding machine, printing calculator, rotary calculator, key-driven calculator / 
Arthur L. Walker, J. Kenneth Roach [and] J. Marshall Hanna. 
 - 3rd ed. 
 - New York :  Gregg Division, McGraw-Hill,  [1967] 
 - 250 p. :  ill. 
<br/><br/><label>ISBN: </label>070678235 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculators--Problems, exercises.