Mercer, G. Lawrence <br/><br/>
Punched card systems   mechanised/2e 

 - 2nd ed. 
 - London  Macdonald and Evans Ltd.  1964 
 - 60p. 
<br/><br/><label>Subjects--Index Terms: </label>Punched card systems 
<br/><br/><label>Dewey Class. No.: </label>651  / MER