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*ARCTIC REGIONS
4
ARCTIC OCEAN
4
CONTINENTAL SHELVES
4
*SEA ICE
3
ALASKA
3
CANADA
3
CLIMATE
3
CONGRESS
3
Ice and Permafrost
3
MERCHANT VESSELS
3
MINERALS
3
NATIONAL SECURITY
3
Snow
3
DENMARK
2
GASES
2
GLOBAL
2
GREENLAND
2
Geography
2
Government and Political Science
2
LEGISLATION
2
NORWAY
2
POLLUTION
2
RISK
2
RUSSIA
2
SHIPPING
2
SHORES
2
TEMPERATURE
2
UNITED STATES
2
WATER
2
*ARCTIC OCEAN
1
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