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2005. Geological Survey (U.S.). This line shapefile represents railroads in the conterminous United States and Alaska at 1:2,000,000. This is a replacement for the December 1998 m... Geological Survey (U.S.).
2014. SeaPlan. The Regulated, Safety and Security Zones map layer identifies areas in which vessel access is either limited or restricted, or within which special... Northeast Ocean Data.