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SOURCES: U.S. Department of Commerce, U.S. Census Bureau, Census 2000 Supplementary Survey for the United States, available at http://factfinder.census.gov/home/en/C2SS.html, as of Mar. 27, 2002. _____. Means of Transportation to Work for the U.S.: 1990 Census, available at http://www.census.gov/population/socdemo/journey/usmode90.txt, as of Sept. 17, 2001.