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Wilderness areas
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1. 2010 U.S. National Atlas Federal Land Lines
2010. U.S. National Atlas Federal Land Lines represents the linear federally owned land features (for example, national parkways and wild and scenic rive... Environmental Systems Research Institute (Redlands, Calif.).
2. U.S. Parks and Protected Land Lines, 1:10 million (2012)
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile depicts 394 authorized Park Service units in the United States only that are over 100,000 acres. The data does not include ... North American Cartographic Information Society.