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Groundwater - Rota sludge well drilling

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* [http://www.practicafoundation.nl www.practicafoundation.nl]

* General info on well drilling [http://www.rwsn.org www.rwsn.org]

* [http://nl.youtube.com/watch?v=MvebFHCjCvk nl.youtube.com/watch?v=MvebFHCjCvk]

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