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AGE
Depth
GRIP/GISP/NGRIP
5
Greenland Ice Core Projects
5
Sampling/drilling ice
5
bottom/max
5
ice/snow
5
top/min
5
Ammonium
4
Calcium
4
Chloride
4
DRILL
4
Drilling/drill rig
4
GISP
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
Sulfate
4
maximum/old
4
minimum/young
4
GISP2-B
2
Calcium cation
1
Chloride anion
1
Diameter
1
Epoch
1
GISP2
1
GISP2-D
1
GRIP
1
Greenland
1
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