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== External links ==
* [[http://en.wikipedia.org/wiki/Ram_pump|General explanation on wikipedia]]* [[http://www.ashdenawards.org/winners/aidfoundation|Article on the AID Foundation hydraulic ram, which won the Ashden Award in 2007]]* [[http://www2.warwick.ac.uk/fac/sci/eng/research/dtu/pubs/tr/lift/|Several in-depth article on the function and construction of hydraulic rams, including detailed drawings. Development Technology Unit (DTU), University of Warwick, UK]]* [[http://www.clemson.edu/irrig/Equip/ram.htm|Low cost self made pump]]* [[http://www.judyofthewoods.net/ram_pump.html|another low tech pump design]]