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- History 88
- Ships 21
- Sea-power 18
- Naval art and science 17
- History, Naval 15
- Shipbuilding 15
- Merchant marine 11
- Naval architecture 11
- Shipping 10
- Technological innovations 10
- Navigation 9
- Officers 9
- Design and construction 8
- Research 8
- Safety measures 8
- Strategic aspects 8
- Naval strategy 7
- Security measures 7
- Warships 7
- World War, 1939-1945 7
- Command and control systems 6
- Hydrodynamics 6
- National security 6
- Prevention 6
- Weapons systems 6
- Evaluation 5
- Harbors 5
- Leadership 5
- Marine engineering 5
- Maritime terrorism 5
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