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- Ocean bottom
- Law and legislation 6
- Oceanographic research stations 4
- Oceanography 4
- Research 4
- Environmental aspects 2
- Fisheries 2
- Germplasm resources conservation 2
- History 2
- Hydrothermal vent ecology 2
- Law of the sea 2
- Marine resources conservation 2
- Marine sciences 2
- Maritime law 2
- Ocean mining 2
- Oceanographers 2
- Submarine topography 2
- Trawls and trawling 2
- Underwater drilling 2
- Underwater exploration 2
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