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1975. United States. Bureau of Transportation Statistics. This point shapefile contains information about vehicle accident characteristics and environmental conditions at the time of the crash, between 197... United States. Bureau of Transportation Statistics.
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.