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Ice and Permafrost
4
Snow
4
BEAUFORT SEA
3
PERMAFROST
3
Physical and Dynamic Oceanography
3
*PERMAFROST
2
ALASKA
2
AST42
2
ICE
2
OCEAN BOTTOM
2
PE62730A
2
*BOUNDARIES
1
*CORE SAMPLING
1
*ELECTROMAGNETIC PROPERTIES
1
*LAND ICE
1
*OCEAN BOTTOM
1
*RADAR SCANNING
1
*SEDIMENTS
1
*SEISMIC WAVES
1
ANOMALIES
1
ATTENUATION
1
Active & Passive Radar Detection & Equipment
1
COLD WEATHER TESTS
1
CONTINENTAL SHELVES
1
DEPTH
1
DETECTION
1
Electricity and Magnetism
1
Electromagnetic surveys
1
FREQUENCY BANDS
1
GEOGRAPHIC DISTRIBUTION
1
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