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Guano --- Guano industry --- Phosphate industry --- Human ecology --- Soil amendments --- Phosphates --- Ecologie humaine --- Engrais et amendements --- History --- Social aspects --- Environmental aspects --- History. --- Histoire --- Industrie --- Aspect social --- Aspect de l'environnement --- Peru --- Pacific Area --- Péru --- Pacifique, Région du --- Environmental conditions --- Commerce --- Conditions environnementales --- World history --- anno 1800-1999 --- Environmental conditions.