Rare Edmontosaurus, one of only few mummified dinosaurs in existence, to go on display at North Dakota Heritage CenterDakota the duckbilled dinosaur might have found permanent digs in Bismarck.State Historical Society director Merl Paaverud said officials have reached a $3m deal to keep the rare mummified fossil on display at the North Dakota Heritage Center, where it will serve as a cornerstone for the facilitys $51m expansion.