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Ammonium
6
Calcium
6
Greenland Ice Core Projects GRIP/GISP/NGRIP
Magnesium
6
Nitrate
6
Potassium
Sampling/drilling ice
AGE
5
Chloride
5
DEPTH, ice/snow
5
GISP
5
Sodium ion
5
Sulfate
5
Age, maximum/old
4
Age, minimum/young
4
Depth, bottom/max
4
Depth, top/min
4
Drilling/drill rig
4
Methane sulfonic acid
2
ALTITUDE
1
Acetate
1
Acetate, standard deviation
1
Aerological investigations
1
Ammonium, standard deviation
1
Calcium, standard deviation
1
Calculated
1
Calculated De Angelis et al, 1997
1
Chloride/Sodium ratio
1
Chlorine, standard deviation
1
DATE/TIME
1
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