1995. National Geospatial-Intelligence Agency. This datalayer is a point coverage representing ferry crossings located throughout current VMap1 geographic coverage areas. Features in this layer ...
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2011. Vanderbilt Engineering Center for Transportation Operations and Research, United States. Bureau of Transportation Statistics, and Waterborne Commerce Statistics Center (U.S.). The National Waterway Network is comprised of a link database and a node database. Links are line strings, which consist of beginning and end point... United States. Bureau of Transportation Statistics.