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U.S. annual coal production, 2008-2018, and weekly steam coal spot prices in 2018 (46819606022).png - MarginalCost
U.S. annual coal production, 2008-2018 (46819606022) (cropped).png - MarginalCost
U.S. coal production, 2005-15; Weekly spot steam prices in 2015 (24225190886).png - Ser Amantio di Nicolao