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*SEA ICE
2
ARCTIC OCEAN
2
COASTAL REGIONS
Ice and Permafrost
2
SEASONS
2
Snow
2
WEATHER
2
*ARCTIC REGIONS
1
*CARGO SHIPS
1
*ICEBREAKERS
1
ARCTIC SEAS
1
BATHYMETRY
1
BIBLIOGRAPHIES
1
CLIMATE
1
CONTINENTAL SHELVES
1
DATA BASES
1
ECONOMIC IMPACT
1
ECONOMICS
1
FORECASTING
1
FOREIGN TECHNOLOGY
1
GEOGRAPHY
1
ICE
1
ICEBREAKING
1
MARINE PROPULSION
1
MARINE TRANSPORTATION
1
Marine Engineering
1
NAVIGATION
1
NORTHERN SEA ROUTE
1
OCEANS
1
OIL SPILLS
1
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