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(2011) Fuel Adjustment, May 2011. Transportation, Department of
(2011) Fuel Adjustment, April 2011. Transportation, Department of
(2011) Flexible fuel vehicle registration report, February 1, 2011. Transportation, Department of
(2008) Flex Fueled Vehicles Registered in Iowa. Transportation, Department of
(2005) An Investigation of User Costs and Benefits of Winter Road Closures, June 2005. Transportation, Department of