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(*GLACIERS
1
(*SURVEYING(GEOGRAPHIC)
1
ANTARCTIC REGIONS
1
Cartography and Aerial Photography
1
DEPTH FINDING
1
GLACIERS)
1
GREENLAND
ICE
1
Ice and Permafrost
1
MEASURING INSTRUMENTS)
1
RADAR EQUIPMENT
1
RADAR REFLECTIONS
1
RADAR SIGNALS
1
RADIO ALTIMETERS
1
SOUND TRANSMISSION
1
Snow
1
TERRAIN
1
TEST EQUIPMENT
1
THICKNESS
1
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