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Boundaries
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Society
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Wilderness areas
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United States
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2012
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1. U.S. Parks and Protected Land Areas with Scale Ranking, 1:10 million (2012)
2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts 394 authorized Park Service units in the United States only with scale rankings that are over 100,000 acres. Scale r... North American Cartographic Information Society.
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.