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North American Cartographic Information Society
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Natural areas
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0
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1. U.S. Parks and Protected Land Areas, 1:10 million (2012)
0. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts 394 authorized Park Service units in the United States only that are over 100,000 acres. The data does not include a... North American Cartographic Information Society.