2002. Environmental Systems Research Institute (Redlands, Calif.), Geological Survey (U.S), and American Geological Institute. This datalayer is a polygon coverage representing First-Order Administrative Areas worldwide (as they existed in 2002) and was originally produced ... American Geological Institute.
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2000. Environmental Systems Research Institute (Redlands, Calif.), Geological Survey (U.S), and American Geological Institute. This datalayer is a point coverage representing cities worldwide and was produced by ESRI and published as part of the USGS Global GIS database. It... American Geological Institute.