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Bogs
Permafrost
5
Biological sampling
3
Blasting
3
Canada
3
Cores
3
Coring
3
Equipment and supplies
3
Logistics
3
Palynology
3
Peat
3
Radiocarbon dating
3
Safety
3
Size
3
Soil profiles
3
Thickness
3
Drainage
2
Environmental impacts
2
Alaska
1
All-terrain vehicles
1
Canadian Arctic
1
Frozen ground
1
Middle North
1
Roads
1
Soils
1
Southcentral
1
Testing
1
Thawing
1
Thermal protection of permafrost
1
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