2 links
The Pilcomayo river basin study: Argentina, Bolivia, Paraguay
oas.org
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
paws.wcu.edu
Research on the transport and environmental impacts of mine effluents in Bolivia and downstream in Argentina and Paraguay.