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1.- A PROPOSED CONTINENTAL-SCALE SOIL GEOCHEMICAL SURVEY OF NORTH AMERICA; ESTABLISHING A DATABASE FOR THE 21ST CENTURY GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 2003 GEOLOGICAL SOCIETY OF AMERICA, 2003 ANNUAL MEETING Ver registro
2.- An international collaborative effort to establish a soil geochemical data base for North America [International Geological Congress]; [location varies]; III; International, 2004 Italia 2004; 32nd international geological congress; abstracts Ver registro
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