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2. Energy Potential Through Bio-Conversion of Agricultural Wastes, Final Report to Four Corners Regional Commission;Burford,1976
3. Characterization of Municipal Solid Waste in the United States;Franklin Associates, Ltd.,1994
4. Turning Great Plains Crop Residues and Other Products into Energy;Heid,1984
5. Silvicultural Biomass Farms, Vol. 2, Biomass Potential of Short Rotation Farms;Howlett,1977