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AGE
7
Sampling/drilling ice
7
ice/snow
DRILL
6
Drilling/drill rig
6
Depth
5
GRIP/GISP/NGRIP
5
Greenland Ice Core Projects
5
bottom/max
5
maximum/old
5
minimum/young
5
top/min
5
Ammonium
4
Calcium
4
Chloride
4
GISP
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
Sulfate
4
GRIP
3
Greenland
3
ISTUK
3
ISTUK electromechanical drill
3
Antarctica
2
Calcium cation
2
Chloride anion
2
Core
2
DEPTH
2
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