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ALASKA
2
PLANTS(BOTANY)
2
TERRAIN
2
(*PERMAFROST
1
(*SOILS
1
*OIL POLLUTION
1
*OIL SPILLS
1
ARCTIC REGIONS
1
ARCTIC SOILS
1
AS710
1
AS910
1
BIOLOGICAL CONTAMINATION
1
BUILDINGS
1
BULLDOZERS
1
CRACKS
1
Civil Engineering
1
DAMAGE
1
DEGRADATION
1
DISPERSANTS
1
DRAINAGE
1
ECOLOGY
1
EROSION)
1
FIRES
1
FOUNDATIONS(STRUCTURES)
1
ICE
1
Ice and Permafrost
1
LAND AREAS
1
MELTING
1
PE61101A
1
PE61102A
1
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