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Vegetation
Arctic regions
10
Permafrost
4
Climate
3
Ecology
3
Forests
3
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3
Soils
3
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2
Deltas
2
Geomorphology
2
Glaciers
2
Hydrology
2
Plant ecology
2
Rivers
2
Snow
2
Temperature
2
Aerial photography
1
Biological adaptation
1
Botany
1
Drainage
1
Ecological research
1
Ecosystems
1
Electrical properties
1
Fauna
1
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1
Geography
1
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1
Islands
1
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1
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