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|   | Social  |   | Social  | 
|   | + | *[https://energypedia.info/History of Biogas History of Biogas]  | 
|   | *[[Socio-Cultural Aspects of Biogas Projects|Socio-Cultural Aspects]]  |   | *[[Socio-Cultural Aspects of Biogas Projects|Socio-Cultural Aspects]]  | 
|   | *[[Biogas - Costs and Benefits|Cost and Benefits of Biogas]]  |   | *[[Biogas - Costs and Benefits|Cost and Benefits of Biogas]]  | 
| − | *[[Benefits for Biogas Users|Benefits for Biogas Users]]
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| − | *[[Social Benefits and Impacts of Biogas Technology|Social Benefits and Impacts of Biogas Technology]]
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| − | *[[History of Biogas|History of Biogas]]
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|   | Environmental  |   | Environmental  |