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*ARCTIC REGIONS
6
ARCTIC OCEAN
6
CANADA
4
CONTINENTAL SHELVES
4
DENMARK
4
Government and Political Science
4
NORWAY
4
RUSSIA
4
*SEA ICE
3
ALASKA
3
CLIMATE
3
CONGRESS
3
Geography
3
Ice and Permafrost
3
MERCHANT VESSELS
3
MINERALS
3
NATIONAL SECURITY
3
Snow
3
*INTERNATIONAL LAW
2
*SHIPPING
2
*UNITED STATES GOVERNMENT
2
CLIMATE CHANGE
2
COAST GUARD
2
CRUDE OIL
2
GASES
2
GLOBAL
2
GREENLAND
2
LEGISLATION
2
LOMONOSOV RIDGE
2
MELTING
2
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