Walker, Arthur L. and Others <br/><br/>
How to use adding and calculating machines   
By Arthur L. Walker, J. Kenneth Roach, and J. Marshall Hanna 
 - New York  McGraw-Hill  1967 
 - 251p. 
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>651.82  / W177.HU