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Sampling/drilling ice
16
AGE
14
Drilling/drill rig
12
Ammonium
11
Calcium
11
Magnesium
11
Nitrate
11
Potassium
11
GISP
10
Sulfate
10
Chloride
9
Sodium ion
8
ice/snow
8
GRIP/GISP/NGRIP
7
Greenland Ice Core Projects
7
DEPTH, ice/snow
6
DRILL
6
GRIP
6
Greenland Ice Core Projects GRIP/GISP/NGRIP
6
Depth
5
Depth, bottom/max
5
Depth, top/min
5
bottom/max
5
maximum/old
5
minimum/young
5
top/min
5
Age, maximum/old
4
Age, minimum/young
4
Calcium cation
4
Chloride anion
4
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