Deltiology is the collecting of picture postcards. A deltiologist is a collector of them. Short of framing them, a preferred means of storing and displaying postcards is in polypropylene sheet protectors.Example postcards:American, Harvard College Football, Murad Company, 1910, postcard, lithograph. In one corner the Harvard pennant flies. In another, Harvard's coat of arms is proudly displayed. And in the middle, Harvard players in crimson play against their perennial rivals from Yale. See flag.