In attempting to date certain commercially produced artifacts, it would
be very helpful to know when the two-capital-letter state abbreviations
came into use -- Ind. became IN, etc.   Also, does anyone have a handle on
the Calif. -> Cal.  and Penna. -> Penn. -> Pa. shifts in common usage?
   People in the post office here have no idea, and Polk's city directories
still use "Mich." on their title page!
   TIA,   Chris Bobbitt     [log in to unmask]
          Curator of Collections
          Monroe Co. Historical Museum
          Bloomington, Ind. (sic)