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B. D. Yacobucci, (2005), Alternative Transportation Fuels and Vehicles: Energy, Environment, and Development Issues, National Council for Science and Environment, retrieved November 5, 2011 from http://ncseonline.org/nle/crsreports/05Jan/RL30758.pdf

Wikipedia http://en.wikipedia.org/wiki/Supply_chain

Some material provided by Maria Janowiak and Kristen Schmitt; Northern Institute for Applied Carbon Science (NIACS) http://nrs.fs.fed.us/niacs/