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    Barrow Island, WA, 1985 (P511), radiometric line dataThe radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive...
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    Barrow Island, WA, 1985 (P511), magnetic line data, AWAGS levelledTotal magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth...
            
            
              
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