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Subject
Oceans
8
Transportation
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8
Environment
6
Harbors--Traffic control
5
Shipping
4
Ships--Automatic identification systems
4
Biology and Ecology
2
Boating surveys
2
Boats and boating
2
Economy
2
Aids to navigation
1
Boundaries
1
Passenger ships
1
Tankers
1
Towboats
1
Tugboats
1