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note
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We thank the Ministry of Water Resources (MWR) of the Sultanate of Oman for their permission to conduct this fieldwork as well as for their logistic and scientific support; Z. Al Suleimani, former Director of Research, and P. Macumber, former Head of the Groundwater Section, MWR, for their assistance during various stages of this project; and U. Beyerle and S. Reese for their laboratory work.
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