Describes the river and plans for restoring hydraulic conditions and water quality in Argentina that have been degraded by sedimentation and mining effluents.

Some facts and information about the Amazon River in South America.

Describes a study undertaken in 1975-1977 to find ways to regulate and develop the Pilcomayo River and its 272,000 km2 trinational basin.

Research on the transport and environmental impacts of mine effluents in Bolivia and downstream in Argentina and Paraguay.