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AGE
3
Calcium
DEPTH
3
Sampling/drilling ice
3
error
3
ice/snow
3
GRIP/GISP/NGRIP
2
Greenland
2
Greenland Ice Core Projects
2
DRILL
1
Drilling/drill rig
1
GISP
1
GISP2
1
GRIP
1
ICEDRILL
1
ISTUK
1
ISTUK electromechanical drill
1
Ice drill
1
NGRIP
1
North Greenland Ice Core Project
1
NorthGRIP
1
water
1
δ18O
1
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