biogas_-_what_it_is_how_it_is_made_how_to_use_it.pdf File Better Farming Series 31. Biogas: what it is; how it is made; how to use it FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATILanguageEnglish Read more about biogas_-_what_it_is_how_it_is_made_how_to_use_it.pdf