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CANADA
2
ICE ISLANDS
Ice and Permafrost
2
SYMPOSIA
2
Snow
2
(*GLACIERS
1
*ANTARCTIC REGIONS
1
*GLACIERS
1
AERIAL PHOTOGRAPHS
1
AERIAL RECONNAISSANCE
1
AIRBORNE
1
ANTARCTIC REGIONS
1
ATMOSPHERIC MOTION
1
DEPTH FINDING)
1
ECHO RANGING
1
GREENLAND
1
MELTING
1
PENETRATION
1
RADAR REFLECTIONS
1
SEA ICE
1
VERY HIGH FREQUENCY
1
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