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Drilling or digging

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* [http://www.hydrology.nl/images/docs/ihp/nl/cop15/2_Richard_Taylor.pdf Groundwater and climate change in Africa: The Kampala Statement.] Richard Taylor, University College London (UK), IAH Commission of Groundwater & Climate Change.

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<font size="4">Acknowledgements</font>

* [http://www.unicef.org/wash/files/04.pdf Understanding Groundwater and Wells in Manual Drilling]. Unicef.org.

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