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Hoogesteger, Jaime, Mark Giordano, Jan Girman, Jack van der Gun, Eloise Kendy, Jacob Kijne, Ramon Llamas, Fadia Daibes, Emilio Custodio, Maria Angelica, Tushaar Shah, and Jacob Burke.
Groundwater: a global assessment of scale and significance. Battaramulla, Sri Lanka: Internation Water Management Institute , 2007.