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[i] Ohio. Department of Development. Office of Strategic Research. Ohio's Logistics Industry. Ohio Department of Development, June 2007. Web. 15 Sept. 2009. <http://www.development.ohio.gov/research/files/b800000000.pdf>.
[ii] U.S. EPA. Clean Air Act. <http://www.epa.gov/air/caa/>
[iii] Clean Air Task Force. Diesel Soot Health Impacts. Clean Air Task Force, 2005. Web. 15 Sept. 2009. <http://www.catf.us/projects/http://www.catf.us/projects/diesel/dieselhealth/state.php?site=0&s=39>.
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