Subject
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Icebreakers (Ships)
9
Merchant marine Safety measures
9
Merchant ships
9
Nuclear ships
9
Restoration ecology
9
Sea-power
9
Ship captains
9
Shipping Economic aspects
9
Greenhouse gas mitigation
8
Shipping Safety regulations
8
Ships Inspection
8
Transportation Security measures
8
Underwater archaeology
8
Warships
8
Evaluation
7
Flags of convenience
7
Freight and freightage
7
Harbors Economic aspects
7
Hijacking of ships
7
Inland water transportation
7
Littoral combat ships
7
Merchant marine Security measures
7
Naval architecture
7
Northwest Coast of North America
7
Piracy
7
Planning
7
Ship propulsion
7
Shipping Safety measures
7
Shipping bounties and subsidies
7
Ships History
7
Ships Scrapping
7
Ships Waste disposal
7
Slave trade History
7
Stranding of ships Environmental aspects
7
Transportation and state
7
United States Foreign relations
7
Containerization
6
Discharge of ballast water Law and legislation
6
Equipment
6
Government vessels
6
Historic ships
6
Infrastructure (Economics)
6
Merchant mariners Legal status, laws, etc
6
National security Law and legislation
6
Oceanography Research
6
Passenger ships
6
Petroleum shipping terminals
6
Shipping Taxation Law and legislation
6
Shipping Technological innovations
6
World War, 1939-1945 Naval operations Submarine
6
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