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

 - 2nd ed. 
 - London  Macdonald and Evans  1964 
 - 27p. 
<br/><br/><label>Subjects--Index Terms: </label>Punched card systems 
<br/><br/><label>Dewey Class. No.: </label>651.5  / MER