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@ClassicTad #alienhighway - The 37th parallel in the United States: https://t.co/V3z8iFtLlt
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@ClassicTad #AlienHighway - An interesting document from USGS : "Aeromagnetic and gravity profiles of the United States along the 37th parallel--A contribution to the upper mantle project" https://t.co/V3z8iFtLlt