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. 2008 Oct 7;117(3):410–416. doi: 10.1289/ehp.11886

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Contour map showing U concentration (μg/L) in tube well water from Jamjami. White circles are shallow tube wells (18–27 m below ground surface (bgs)], gray circles are intermediate tube wells (28–37 m bgs), and black circles are deep tube wells (38–55 m bgs). The red contour line represents the area with wells that exceed the 2 μg/L WHO health-based drinking water guideline.