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Environmental sciences
Ecology
3
Birds--Breeding
1
Carbon cycle (Biogeochemistry)
1
Carbon cycle (Biogeochemistry)--Environmental aspects
1
Climatic changes
1
Ecosystem health
1
Herbivores--Ecology
1
Plant phenology
1
Remote sensing
1
Songbirds--Habitat
1
Songbirds--Migration
1
Tundra ecology
1
Vegetation and climate
1
Vegetation surveys--Remote sensing
1
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