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  2. Textoris, Steven D. [Other]; Bermúdez-Lugo, Omayra [Other]

    Conflict minerals from the Democratic Republic of the Congo : global tungsten processing plants, a critical part of the tungsten supply chain

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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 ; 2014,3069

  4. Anderson, Charles [Author]

    Conflict minerals from the Democratic Republic of Congo : tin processing plants, a critical part of the tin supply chain

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    Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2015

    Published in: United States Geological Survey: USGS fact sheets ; 2015,3022

  5. Papp, John F. [Author]

    Conflict minerals from the Democratic Republic of the Congo : global tantalum processing plants, a critical part of the tantalum supply chain

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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 ; 2014,3122