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1Published 2011Subjects: “...Oil-shale industry Bakken Formation Maps....”
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2Published 2012Subjects: “...Oil-shale industry Bakken Formation Maps....”
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3Published 2013Subjects: “...Oil-shale industry Bakken Formation Maps....”
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4Published 2014Subjects: “...Oil-shale industry Bakken Formation Maps....”
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5Published 2013Subjects: “...Petroleum industry and trade Alberta Exshaw Maps....”
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