Complément au Guide prèliminaire du XVIIe Congrès de l`Union postale universelle 

 - Berna  Union Postale Universelle  1974 
 - 22p.  ilus.  30 cm 
<br/><br/> Supplement to the Preliminary Guide to the 17th Congress of the Universal Postal Union 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecomunicaciones<br/>Congresos y conferencias<br/>Informes