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CRS-2 1 A brief definition for each classification, together with a description of each unit of the System, is included in U.S. Dept. of the Interior, Nati onal Park Service, Office of Public Affairs and Harpers Ferry Center, The National Parks: Index 2005-2007 (Washington, DC: GPO, 2005). 2 Extensions or establishment of monuments in Wyoming require the authorization of Congress (16 U.S.C.