Transportation policy of the United States

University of Akron Center for Policy Studies. Akron, Ohio, United States. ^ Leip, David. 2004 Presidential General Election Results. Atlas of U.S. Presidential

Parkhurst, G. (In Press) The Paradox of Intensification. Transport Policy 18 (1) ^ Housing Affordability Trends: USA States. Demographia. Retrieved on

Ozone Standards”. Surface Transportation Policy Project (April 16, 2004). May 16, 2006閲覧。 ^ “Pa. ranks among worst states for toxic emissions”. Pittsburgh

Minnesota Department of Commerce. 2006年11月24日時点のオリジナルよりアーカイブ。2006年11月26日閲覧。 ^ “Wind Energy Projects Throughout the United States of America”. The American Wind

Accessed November 10, 2013. ^ Fifteenth Census of the United States : 1930 - Population Volume I, United States Census Bureau, p. 715. Accessed February 8