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\bibitem{Vogel_etal1999} Vogel, J. C., Talma, A. S., Heaton, T. H. E., \& Kronfeld, J. (1999). Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer. \textit{Journal of Geochemical Exploration}, \textit{66}(1), 269--276.

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