Local phosphate resources for sustainable development in Central and South America. Appleton, J. D.; Notholt, J. G. 2002 British Geological Survey, Department for International Development, Economic Minerals and Geochemical Baseline Program, Report CR/02/122/N You can download complete PDF version at / Puedes bajar la versión completa en PDF en: https://mariantoc.github.io/minerals.html#AppletonJDNotholtJG2002

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