From the mid-1970's to the early '80's, the Smithsonian's National Air and Space Museum produced its "Aviation Relic Series" of limited-edition prints, featuring 2" square pieces of fabric from various historical aircraft in their collection. These were from aircraft that were going through restoration at the time to replace deteriorating original fabric. The National Air & Space Museum kept some large pieces of the original fabric in their collection for future reference but they decided to make some original fabric available to the public through this poster series to stimulate more interest in the museum. It seems remarkable that the Smithsonian would sell off such significant artifacts, and after a few years, not surprisingly, the museum decided that this was not a good idea after all and their policy now forbids this practice.