WR Harding, and JC Taylor. “Diatoms As Indicators of Historical Water Quality: A Comparison of Samples Taken in the Wemmershoek Catchment (Western Province, South Africa) in 1960 and 2008”. Water SA 40, no. 4 October (March 30, 2025). Accessed May 10, 2025. https://watersa.net/article/view/21711.