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== External links ==
 
== External links ==
 
* [[Wikipedia:Biogas]]
 
* [[Wikipedia:Biogas]]
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* http://www.rebelwolf.com/essn/ESSN-Oct2005.pdf
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* [http://www.green-trust.org/freebooks/ Al Rutan's Bio-digester manual]
 
* [http://www.youtube.com/watch?v=3Sl0XEN5Bgo Video: Low cost biodigester installation on the Altiplano. Bolivia]
 
* [http://www.youtube.com/watch?v=3Sl0XEN5Bgo Video: Low cost biodigester installation on the Altiplano. Bolivia]
 
* [http://www.youtube.com/watch?v=rYntOAAQZZ4 Video: Industrial Two-Stage Biogas Plant. Germany]
 
* [http://www.youtube.com/watch?v=rYntOAAQZZ4 Video: Industrial Two-Stage Biogas Plant. Germany]
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