In this Wednesday, May 24, 2017, photo, a smokestack from an Old West-era meatpacking plant is shown in Theodore Roosevelt National Park in western North Dakota. The park is known for hills, ridges, buttes and bluffs where millions of years of erosion have exposed colorful sedimentary rock layers. A company wants to build an oil refinery about 3 miles from the park, but some worry about air pollution in the park.(AP Photo/Blake Nicholson)
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