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== External links ==
* General Background [http://www.unep.org www.unep.org ]
* General Background [http://www.rainfoundation.org www.rainfoundation.org ]
* General Background [http://www.hrwallingford.co.uk www.hrwallingford.co.uk ]
* General Background [http://www.rainwaterharvesting.org www.rainwaterharvesting.org ]
