Guide to common filamentous freshwater macroalgae in South Africa Guide to common filamentous freshwater macroalgae in South Africa
Effect of pollutants on the physiology of fish in the Olifants River (Eastern Transvaal) Effect of pollutants on the physiology of fish in the Olifants River (Eastern Transvaal)
Conceptual design report for a national river water quality assessment programme Conceptual design report for a national river water quality assessment programme