| http://www.w3.org/ns/prov#value | - But now what we????????re seeing is a trend upward in the prevalence of the disease among miners who began working in the industry after that Act was passed. ?? ???????This is happening for one of two reasons,??????? Roberts said. ???????Either the respirable dust standard is not being enforced by the Mine Safety and Health Administration (MSHA), or the standard is still too high.
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