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\bibitem{Neal_etal2007} Neal, C., Neal, M., Hughes, S., Wickham, H., Hill, L., \& Harman, S. (2007). Bromine and bromide in rainfall, cloud, stream and groundwater in the Plynlimon area of mid-Wales. \textit{Hydrology and Earth System Sciences}, \textit{11}(1), 301--312.

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