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Date: 2009-05-14 07:36:13Water wells Appropriate technology Well drilling Oil well Drill bit Drilling Hammer drill Drill Sludging Drilling rig | Microsoft Word - Rota and stone combined[1].docAdd to Reading ListSource URL: www.watersanitationhygiene.orgDownload Document from Source WebsiteFile Size: 177,51 KBShare Document on Facebook |