FILE - In this Jan. 9, 2014, file photo, rail cars are filled with coal and sprayed with a topper agent to suppress dust at Cloud Peak Energy's Antelope Mine north of Douglas, Wyo. Six of the country's major energy-producing states have slipped into recession after a sharp decline in production and exploration over the last 18 months caused their tax revenue to plummet, according to a financial analysis released Tuesday, Jan. 24, 2017. (Ryan Dorgan/Casper Star-Tribune via AP, File)
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