The Amazon River: Some facts and information about the Amazon River in South America.The Pilcomayo river basin study: Argentina, Bolivia, Paraguay: Describes a study undertaken in 1975-1977 to find ways to regulate and develop the Pilcomayo River and its 272,000 km2 trinational basin.The Transport and Fate of Heavy Metals Within the Pilcomayo River Basin, Bolivia: Research on the transport and environmental impacts of mine effluents in Bolivia and downstream in Argentina and Paraguay.