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Estudio de la contaminación del río Aconcagua
(CORFO, 1971)
GEMS Water data evaluation report 1983
(GEMS, 1983)
GEMS Water data summary
(GEMS, 1983)
Selected biological characteristics of streams in the southeastern Uinta basin, Utah and Colorado
(Geological Survey, 1981)
Water quality control in the humid tropics
(ORSTOM, 1989)
Standard Methods : for the examination of water and wastewater
(American Public Health Association, 1985)