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▪ Websites
- EPA Renewable Fuels: Regulations & Standards. www.epa.gov/otaq/fuels/renewablefuels/regulations.htm
- European Comission – generalised system of preferences. http://ec.europa.eu/trade/wider-agenda/development/generalised-system-of-preference
- FAOSTAT. ResourceSTAT–Land. http://faostat.fao.org/site/377/DesktopDefault.aspx?PageID=377#ancor