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. 2016 Jan 1;124(1):A13–A18. doi: 10.1289/ehp.124-A13

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graphic file with name ehp.124-A13.g005.jpg — In 1974, shortly after the Coal Act went into effect, PMF affected nearly 3.5% of coal miners with 25 or more years of underground mining tenure. Rates dropped precipitously under the new protective rules but have since rebounded, shooting up 900% over the past 15 years.

Source: Blackley et al. (2014)⁷