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The skeletons of the duck-billed dinosaurs, Edmontosaurus Annectens – which lived more than 66 million years ago in the late Cretaceous period – were unearthed in 1908 in a ravine area of east-central Wyoming
The skeletons of the duck-billed dinosaurs, Edmontosaurus Annectens – which lived more than 66 million years ago in the late Cretaceous period – were unearthed in 1908 in a ravine area of east-central Wyoming