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(*GLACIERS
2
ANTARCTIC REGIONS
2
GREENLAND
Ice and Permafrost
2
RADAR REFLECTIONS
Snow
2
(*SURVEYING(GEOGRAPHIC)
1
AERIAL PHOTOGRAPHS
1
AERIAL RECONNAISSANCE
1
AIRBORNE
1
CANADA
1
Cartography and Aerial Photography
1
DEPTH FINDING
1
DEPTH FINDING)
1
GLACIERS)
1
ICE
1
ICE ISLANDS
1
MEASURING INSTRUMENTS)
1
MELTING
1
PENETRATION
1
RADAR EQUIPMENT
1
RADAR SIGNALS
1
RADIO ALTIMETERS
1
SOUND TRANSMISSION
1
SYMPOSIA
1
TERRAIN
1
TEST EQUIPMENT
1
THICKNESS
1
VERY HIGH FREQUENCY
1
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