The Mifflin County Historical Society's 2020 Picture the Past Calendar (8 1/2" x 11") features Real Photo Postcards, RPPC, a popular photographic form of postal communication. The full color 2020 calendar cover illustrates a typical real photo postcard of the early to mid-20th century. It has been said of real photo postcards that no other single format has provided such a massive photo history of the United States, particularly of small-town and rural America where photography was often a luxury. Examples of the twelve featured images, appear in black and white throughout, can found on the back cover image.