https://www.biocycle.net/anaerobic-digestion-of-pig-manure-spain/
Anaerobic Digestion Of Pig Manure (Spain) | BioCycle
Oct 25, 2010 - BioCycle October 2010, Vol. 51, No. 10, p. 41 Spain Two facilities in Toledo region, constructed to service small hog farms, yield heat, electricity and...
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