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Introduction In Coal Mining

An Introduction to Coal Science, Society, & Technology. Eric Chastain, Kelsey Johnson, Marielle Narkiewicz, Brad . ... Trends in U.S. Coal Mining. 0 100000 200000 300000 400000 500000 600000 700000 800000 1923 1933 1943 1953 1963 1973 1983 1993. Year. Num b e r of Mine rs. 0 100000 200000 300000 400000 500000 600000

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