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Economics Lessons of Biofuels.
Douglas G. Tiffany
Minnesota Council on Economic Education
University of Minnesota
March 22, 2007. pdf

Growth in Renewable Fuels and Effects on Feeds Markets.
Douglas G. Tiffany
Minnesota Nutrition Conference
St. Paul, Minnesota
September 20, 2005. pdf

Economic Comparison of Dry-Grind and Ligno-Cellulosic Ethanol Production.
Douglas G. Tiffany
Renewable Energy in the Upper Midwest
Grand Forks, North Dakota
February 23, 2005. pdf