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A half-century ago, the nation`s top health experts urged the federal agency in charge of mine safety to adopt strict rules protecting miners from
The rule cuts the exposure limit for silica dust from 100 to 50 micrograms per cubic meter of air.
CHARLESTON, W.Va. (AP) -- A half-century ago, the nation`s top health experts urged the federal agency in charge of mine safety to adopt strict rules
The rule cuts the exposure limit for silica dust from 100 to 50 micrograms per cubic meter of air.
CHARLESTON, W.Va. (AP) — A half-century ago, the nation's top health experts urged the federal agency in charge of mine safety to adopt strict rules protecting miners from poisonous rock