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Author
I.M. Systems Group
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Public
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Subject
Transportation
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Place
Massachusetts
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Year
2012
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1. Aids to Navigation, Northeast United States, 2012
2012. I.M. Systems Group. This point shapefile represents marine aids to navigation in the Northeastern United States. The Coast Guard maintains systems of marine aids to na... Coastal Services Center (U.S.).
2. Marine Transportation, Northeast United States, 2012
2012. I.M. Systems Group. This polygon shapefile represents the geographic location and identity of designated areas used to manage vessel traffic in the northeast United St... United States. National Oceanic and Atmospheric Administration.