The connoisseur catalogue of machine stamps /  
edited by James Negus. 
 - 9th ed. 
 - London:   Connoisseur Publications,   1992.  
 - 386 p. ;  21 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0951132733 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Γραμματόσημα
<br/><br/><label>Dewey Class. No.: </label>769.56