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\bibitem{Schwiede_etal2005} Schwiede, M., Duijnisveld, W. H. M., \& B{\"o}ttcher, J. (2005). Investigation of processes leading to nitrate enrichment in soils in the Kalahari Region, Botswana. \textit{Physics and Chemistry of the Earth, Parts A/B/C}, \textit{30}(11), 712--716.

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