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http://www.napta.net/actioncenter/resources/publications/preserving_air.asp
http://www.treehugger.com/files/2007/07/number_of_the_d.php
http://www.coloribus.com/adsarchive/prints/public-transportation-tramway-3867605/
http://11even.net/tag/concept/
http://blog.ziggytek.com/2010/10/01/solar-powered-hovercraft-%E2%80%93-future-public-transportation/
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