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  1. Haxel, Gordon B. [Author]; Hedrick, James B. [Author]; Orris, Greta J. [Author]

    Rare earth elements : critical resources for high technology

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    Reston, Va: U.S. Dept.of the Interior, U. S. Geological Survey, 2002

    Published in: United States Geological Survey: USGS fact sheets ; 2002,087