Hazlett, Ryan & Cresswell, Lauren. Examining the Market Potential for Natural-Gas Powered Trucks: Barriers and Opportunities for Promoting Environmental Sustainability and Economic Prosperity, report, August 2014; (https://texashistory.unt.edu/ark:/67531/metapth839017/m1/1/: accessed April 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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