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1.- APPLICATION OF ENZYME LEACH SOIL ANALYSIS FOR EPITHERMAL GOLD EXPLORATION IN THE ANDES OF ECUADOR
PERGAMON; OXFORD-NEW YORK-BEIJING; III; INTERNATIONAL, 2002
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2.- FLUVIAL CONTAMINATION ASSOCIATED WITH ARTISANAL GOLD MINING IN THE PONCE ENRIQUEZ, PORTOVELO-ZARUMA AND NAMBIJA AREAS, ECUADOR
KLUWER ACADEMIC PUBLISHERS; DORDRECHT; NLD; NETHERLANDS, 2001
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