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  1. Hammarstrom, Jane M. [Author]; Zientek, Michael L. [Author]; Parks, Heather L. [Author]; Dicken, Connie L. [Author]

    Assessment of undiscovered copper resources of the world, 2015

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    Reston: U.S. Geological Survey, 2018

    Published in: United States Geological Survey: Scientific investigations report ; 2018,5160,P

  2. Johnson, Kathleen M. [Other] ; United States Geological Survey

    Estimate of undiscovered copper resources of the world, 2013

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    Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2014

    Published in: United States Geological Survey: USGS fact sheets ; 2014,3004