Went to the Minnesota State Fair, the countries largest state fair, today and went to the Hobby & Crafts Building. I saw the winner in the Philatelic Division. A person submitted a Columbian Expo Exhibit
with all the 1893 Columbians, all the Columbian cut squares, and the later Columbian Souvenir Sheets of 1992. I've never seen them all together at one time. It was well arranged with additional documentation by the presenter. Very cool!
I've thought about doing something myself on the precancels of Minnesota, but I still have a dozen to locate out of the 668 there.