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Acknowledgements
==Acknowledgements==
* Jane Olley, [http://www.cd3wd.com/cd3wd_40/cd3wd/Practact/KnO-100410-human_animal_water_lifters.pdf HUMAN & ANIMAL POWERED WATER-LIFTING DEVICES FOR IRRIGATION]. Practical Action, November 2008.
* [http://docs.watsan.net/Scanned_PDF_Files/Class_Code_2_Water/230-85HU-1269.pdf Human and Animal-Powered Water Lifting Devices: A state of the art survey].
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