"United States. Economics, Statistics, and Cooperatives Service. National Economic Analysis Division." . . "Anaerobic digestion." . . . . . . . . "An assessment of anaerobic digestion in U.S. agriculture"@en . . . . . . . "An assessment of anaerobic digestion in US agriculture"@en . . . . . . . . . . . . . . . . . . "Assessment of Anaerobic Digestion in U.S. Agriculture"@en . . "Methane generation." . .