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WikiPedia: Washington,_D.C. ftp://ftp.atdd.noaa.gov/pub/GCOS/WMO-Normals/TABLE... ftp://ftp.ncdc.noaa.gov/pub/data/normals/1981-2010... http://www.abfa.com/ogc/hract.htm http://abcas3.accessabc.com/ecirc/newsform.asp http://www.amtrak.com/pdf/AmtrakBackgroundInformat... http://www.apta.com/research/stats/ridership/rider... http://www.breitbart.com/article.php?id=d8nvbuv81&... http://www.britannica.com/EBchecked/topic/636322 http://www.businessweek.com/lifestyle/content/oct2... http://archives.cnn.com/2002/US/05/23/flight.93/in...