c1948 RPPC ~ Mississippi River & Prairie Du Chien, Wisconsin From McGregor, Iowa ~ #-7149. Vintage Real Photograph Postcard is selling as a used standard size postcard. The frontside of postcard is in Good Condition, the backside of the postcard looks to have been glued in a scrapbook. Nice Vintage Picture Postcard of the McGregor, Iowa, the Mississippi River and Prairie du Chien, Wisconsin. See pictures for condition information and card details. I do combine shipping.