1992. National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency). This datalayer is a polyline coverage representing hypsographic features (contour lines) located throughout DCW (Digital Chart of the World) geogra... National Imagery and Mapping Agency.
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2010. DeLorme (Firm) and Environmental Systems Research Institute (Redlands, Calif.). World Contours represents the 600-meter interval contour lines of the world. Esri.