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\bibitem{Merkel_etal2008} Merkel, B., Planer-Friedrich, B., \& Nordstrom, D. (2008). Groundwater Geochemistry: A Practical Guide to Modeling of Natural and Contaminated Aquatic Systems. \textit{Groundwater Geochemistry, by B.J. Merkel and B. Planer-Friedrich. Edited by D.K. Nordstrom. Berlin: Springer, 2008. ISBN: 978-3-540-74667-6}, .

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