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Bucket elevators, Persian wheels and Norias

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→‎Acknowledgements

==Acknowledgements==

* [http://www.fao.org/docrep/010/ah810e/AH810E05.htm REVIEW OF PUMPS AND WATER LIFTING TECHNIQUES.] Natural Resources Management and Environment Department, Food and Agriculture Organization (FAO).

* [http://lurkertech.com/water/pump/morgan/tripod/ The story of a waterwheel.]

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