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Geology and mineralogy of the Apex Germanium-Gallium Mine, Washington County, Utah
GEOLOGY mineralogy Apex-Germanium-Gallium-Min
GEOLOGY mineralogy Apex-Germanium-Gallium-Min -- Geology and mineralogy of the Apex Germanium- -- Gallium Mine,Washington County,Utah.1986 -- s.BERNSTEIN,Lawrence R. [Verf.]