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1.- NATURE, DISTRIBUTION AND BIOLOGICAL SIGNIFICANCE OF PHOSPHORUS IN FORESTS SOILS FROM PUERTO RICO, CHILE, AND BRAZIL 1999 Ver registro
2.- PHOSPHORUS FRACTIONATION ON FOREST SOILS IN PUERTO RICO AND THE CORDILLERA DE PICHUE, CHILE; BIOGEOCHEMICAL IMPLICATIONS GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 1998 GEOLOGICAL SOCIETY OF AMERICA, 1998 ANNUAL MEETING Ver registro
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