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GSNSW Batemans Bay Narooma magnetic first vd grid geodetic
Total 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... -
Sir Samuel magnetic grid geodetic
Total 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...