Rare! 1934 Space Flight From South Dakota Postcards

You are bidding on a lot of four vintage real photo postcards portraying the 1934 flight of Stratosp, the first balloon flight into the Stratosp This appears to have been a joint effort by the National Geographic Society and the US Army Corps. The four cards show the balloon and the three captains, a view of the stratosp bowl, the night view of the bowl at 3:30 AM on July 28, 1934 just before the balloon went up, and the balloon during the day. Really a great group of historic photos. I have also listed another lot of stratosp flight postcards this week, please see my other auctions. The cards are unused but were were in an album so they do have some corner wear and marks.
Good Luck Bidding!