National Park Service Central Subject Files, 1919-1981 (bulk, 1920-1978).
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Grand Canyon National Park (Agency : U.S.)
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Grand Canyon National Park, located in northwestern Arizona, is the 15th site in the United States to have been named as a national park. The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World....