Deltiologists specialize in this collectible & may "wish you were here" at their meetings
[DOC] [TLE] Volume 4 - Information Services and Technology - University of ... [PAR] An Entangled Object: The Picture Postcard as Souvenir and Collectible, 
Exchange and Ritual .... inscribed by their users as much as at the .... as a 
communication mediummay be .... for instance specialized seasonal greet- ...... 
to the glorious heyday of deltiology, so ....