Changes

<br>

* VIDEO: [http://www.thewaterchannel.tv/en/videos/categories/displayresults/0?pattern=manual%20drilling&rpp=10&sort=0&ep=&ex= Lots of manual drilling videos]. Produced by UNICEF.

* Arjen van der Wal, [http://www.practica.org/wp-content/uploads/services/publications/drilling%20manuals/EN/Understanding%20Groundwater%20%26%20Wells%20PRACTICA%20EN%20June%202010.pdf UNDERSTANDING GROUNDWATER & WELLS In Manual Drilling: INSTRUCTION HANDBOOK for manual drilling teams on hydro-geology for well drilling, well installation and well development]. Practica Foundation. June 2010 (2nd Edition). French version: [http://www.practica.org/wp-content/uploads/services/publications/drilling%20manuals/FR/Understanding%20Groundwater%20%26%20Wells%20PRACTICA%20FR%20June%202010.pdf CONNAISSANCES DES METHODES DE CAPTAGE DES EAUX SOUTERRAINES: appliquées aux forages manuels].

<br>

* [http://www.uneca.org/acpc/about_acpc/policy_documents/papers/WP6-Groundwater%20final%20draft.pdf Management of Ground Water in Africa Including Transboundary Aquifers: Implications for Food Security, Livelihood and Climate Change Adaptation.] United Nations Economic Commission for Africa, African Climate Policy Centre, 2011.