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Walter Energy. (April 13, 2015). Walter Energy's metallurgical coal sales from 2009 to 2014 (in million metric tons) [Graph]. In Statista. Retrieved January 22, 2021, from https://www.statista.com/statistics/217085/coal-sales-of-walter-energy/
Walter Energy. "Walter Energy's metallurgical coal sales from 2009 to 2014 (in million metric tons)." Chart. April 13, 2015. Statista. Accessed January 22, 2021. https://www.statista.com/statistics/217085/coal-sales-of-walter-energy/
Walter Energy. (2015). Walter Energy's metallurgical coal sales from 2009 to 2014 (in million metric tons). Statista. Statista Inc.. Accessed: January 22, 2021. https://www.statista.com/statistics/217085/coal-sales-of-walter-energy/
Walter Energy. "Walter Energy's Metallurgical Coal Sales from 2009 to 2014 (in Million Metric Tons)." Statista, Statista Inc., 13 Apr 2015, https://www.statista.com/statistics/217085/coal-sales-of-walter-energy/
Walter Energy, Walter Energy's metallurgical coal sales from 2009 to 2014 (in million metric tons) Statista, https://www.statista.com/statistics/217085/coal-sales-of-walter-energy/ (last visited January 22, 2021)
