Contributions to economic geology, 1917, Part I, Metals and nonmetals except fuels--Possibilities for manganese ore on certain undeveloped tracts in the Shenandoah Valley, Virginia | Zendy

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Contributions to economic geology, 1917, Part I, Metals and nonmetals except fuels--Possibilities for manganese ore on certain undeveloped tracts in the Shenandoah Valley, Virginia

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