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1.- EXPERIMENTAL AND FIELD OBSERVATIONS OF HEAVY METAL LEACHING FROM HISTORICAL TAILINGS AT THE SAN NICOLAS MINE; IMPACT ON THE LOCAL WATER, GUANAJUATO, MEXICO GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 2000 GEOLOGICAL SOCIETY OF AMERICA, 2000 ANNUAL MEETING Ver registro
2.- NATURAL VS. ANTHROPOGENIC HEAVY METAL SOURCES, GUANAJUATO MINING DISTRICT, CENTRAL MEXICO GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 2001 GEOLOGICAL SOCIETY OF AMERICA, 2001 ANNUAL MEETING Ver registro
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