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Paleoclimate
6
nitrous oxide
6
AGE
4
Gas age
4
Nitrogen dioxide
4
Ice core
3
ice core
3
DEPTH
2
DEPTH, ice/snow
2
Ice drill
2
ice/snow
2
Antarctica
1
EMD-D
1
Electromechanical drill
1
Electromechanical drill, dry hole
1
Greenland
1
ICEDRILL
1
NEEM
1
Styx
1
Styx Glacier
1
Victoria Land
1
dry hole
1
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