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Meteorology
4
(*CLIMATE
3
(*LAKES
3
ARCTIC REGIONS
3
CANADA
3
PLANTS(BOTANY)
3
(*ECOLOGY
2
(*GEOLOGIC AGE DETERMINATION
2
*NORTH AMERICA)
2
AERIAL RECONNAISSANCE
2
AIRBORNE
2
BIOCLIMATOLOGY
2
BOLOMETERS
2
GEOGRAPHY
2
HEAT TRANSFER)
2
HUDSON BAY)
2
ICE
2
INFRARED EQUIPMENT
2
MAPS
2
MEASUREMENT
2
METEOROLOGICAL PHENOMENA
2
NORTH AMERICA)
2
PALEOCLIMATOLOGY
2
PERIODIC VARIATIONS
2
RADIOCARBON DATING
2
SWAMPS
2
TERRAIN
2
TREE RING ANALYSIS
2
(*AIR MASS ANALYSIS
1
(*GLACIERS
1
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