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    • Surface Concentrations of Manganese Nodules - Nature

      Nature· 21 hours ago

      MANGANESE nodules were investigated during the Downwind Expedition, a part of the International Geophysical Year programme of the Scripps Institution of Oceanography of the University of California ...

    • Problems of Mining at Great Depths - Nature

      Nature· 19 hours ago

      THE heights of mountains and the depths of oceans are measured from sea-level; depths in mining are measured from the surface at the particular spot. The ...