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Concrete production and drought

116 bytes added, 23:52, 4 June 2012
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* Concrete poker vibrator (commercial product). Found at [http://www.alibaba.com/showroom/portable-concrete-poker-vibrator.html Alibaba.com.]
* Video: [http://www.howcast.com/videos/155401-How-To-Mix-Concrete-By-Hand How to mix concrete by hand.]
 
==Acknowledgements==
* CARE Nederland, ''Desk Study Resilient WASH systems in drought prone areas.'' October 2010.
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