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(*GLACIERS
2
(*SURVEYING(GEOGRAPHIC)
ANTARCTIC REGIONS
Cartography and Aerial Photography
2
DEPTH FINDING
2
GLACIERS)
2
GREENLAND
Ice and Permafrost
2
MEASURING INSTRUMENTS)
2
RADAR EQUIPMENT
2
RADAR SIGNALS
2
RADIO ALTIMETERS
2
Snow
2
(*DEPTH FINDING
1
ADSORPTION
1
AIRBORNE)
1
ELECTROMAGNETIC WAVE REFLECTIONS
1
GEOPHYSICS
1
ICE
1
MAPPING
1
RADAR REFLECTIONS
1
REFLECTORS
1
SOUND TRANSMISSION
1
SURVEYING(GEOGRAPHIC)
1
TERRAIN
1
TERRAIN AVOIDANCE
1
TEST EQUIPMENT
1
THICKNESS
1
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