Mercer, G. Lawrence <br/><br/>
Adding and calculating machines/3e 

 - 3rd ed. 
 - London  Macdonald and Evans  1965 
 - 64p. 
<br/><br/><label>Subjects--Index Terms: </label>Adding- calculating machines 
<br/><br/><label>Dewey Class. No.: </label>658.27  / MER