1997. United States. National Imagery and Mapping Agency. This datalayer is a point coverage representing airports and airfields worldwide and was published as part of the USGS Global GIS : global coverage... American Geological Institute.
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1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing railroads worldwide and was published as part of the USGS Global GIS : global coverage database.... American Geological Institute.
1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing major roads and trails worldwide and was published as part of the USGS Global GIS : global cover... American Geological Institute.
2004. United States. National Imagery and Mapping Agency. World Port Index, 2004 is a point theme representing port facilities worldwide. This dataset was derived from the 17th Edition of the World Port In... National Imagery and Mapping Agency.
2011. United States. National Imagery and Mapping Agency. World Port Index, 2011 is a point theme representing port facilities worldwide. This dataset was derived from the 21st Edition of the World Port In... National Imagery and Mapping Agency.
2012. Research Data Services (RDS), Columbia University Libraries and United States. National Imagery and Mapping Agency. World Port Index, 2012 is a point theme representing port facilities worldwide. This dataset was derived from the 22nd Edition of the World Port In... National Imagery and Mapping Agency.
2014. Research Data Services (RDS), Columbia University Libraries and United States. National Imagery and Mapping Agency. World Port Index, 2014 is a point theme representing port facilities worldwide. This dataset was derived from the 23rd Edition of the World Port In... National Imagery and Mapping Agency.
