2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This point shapefile depicts the locations of 394 authorized Park Service units in the United States only that are over 100,000 acres. The data doe... North American Cartographic Information Society.
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2006. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). This point shapefile depicts physical and cultural geographic features of all types, not including roads and highways, within the nine county San F... Bay Area Open Space Council.