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