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*ANTARCTIC REGIONS
2
*ARCTIC REGIONS
2
*SEA ICE
2
AERIAL RECONNAISSANCE
2
AREA COVERAGE
2
Cartography and Aerial Photography
2
FILES(RECORDS)
2
Ice and Permafrost
2
Snow
2
*AERIAL PHOTOGRAPHS
1
*MICROFILM
1
*POLAR REGIONS
1
*SCIENTIFIC SATELLITES
1
AERIAL PHOTOGRAPHS
1
FORECASTING
1
Information Science
1
MICROFILM
1
REMOTE DETECTORS
1
Remote sensing
1
SCIENTIFIC SATELLITES
1
Unmanned Spacecraft
1
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