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Geography
4
History
4
530 Physics
2
580 Plants (Botany)
1
580 Plants Botany
1
Archeology
1
Betula woodlands
1
Earth-Surface Processes
1
Ecology
1
Global and Planetary Change
1
Paleontology
1
SCP (spheroidal carbonaceous particles)
1
coal mining
1
microscopic charcoal
1
paleoecology
1
pollen
1
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