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*[http://www.practicafoundation.nl/wp-content/uploads/PDF/Practica%20drilling%20Rs%20versie%201th%20september%2005.pdf Rota-sludge and stone hammer drilling, Part 1, Drilling manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation].
*[http://www.practicafoundation.nl/wp-content/uploads/PDF/practica-production-rs-versie-1th-september-051.pdf Rota-sludge and stone hammer drilling, Part 2, Production manual]. Produced by [http://www.practicafoundation.nl PRACTICA Foundation] and [http://www.etc-international.org/index.php?id=41 ETC Foundation].
*High quality manuals for Rota-sludge drilling, well digging and other manual drilling and digging methods are available as well from Connect International ([http://www.connectinternational.nl/english/smartmodules/smart-tec/wells-boreholes/handdrilling)Connect International]. They are for free for organizations that which are a member of Connect International (cost: 50 Euro; see: [http://www.connectinternational.nl/files/membership.pdfmember of Connect International] (cost: 50 Euro per year).
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