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1.- MINERALOGICAL AND CHEMICAL STUDIES OF VOLCANIC-RELATED ARGILLACEOUS INDUSTRIAL MINERALS OF THE CENTRAL AMERICAN CORDILLERA (WESTERN EL SALVADOR)
ECONOMIC GEOLOGY PUBLISHING COMPANY; LANCASTER, PA; USA; UNITED STATES, 2000
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2.- MINERALOGICAL AND CHEMICAL VARIATIONS IN HYPOGENE AND SUPERGENE KAOLIN DEPOSITS IN A MOBILE FOLD BELT; THE CENTRAL ANDES OF NORTHWESTERN PERU
SPRINGER-VERLAG; BERLIN; DEU; FEDERAL REPUBLIC OF GERMANY, 1997
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