Coal miners say new limits on rock dust 'could save some lives' Miners and their advocates testify in favor of new silica regulatio...
Coal miners say new limits on rock dust 'could save some lives'
Miners and their advocates testify in favor of new silica regulations aimed at preventing black lung disease
Read more on NPR
Miners and their advocates testify in favor of new silica regulations aimed at preventing black lung disease
Read more on NPR
