By THE ASSOCIATED PRESS
National coal mining deaths dropped by more than half the year after the 2010 Upper Big Branch mine explosion in West Virginia, from 48 to 21, and there were 20 each in 2012 and 2013, and a record low of 15 so far in 2014. The U.S. averaged about 30…
Published: December 21, 2014 at 06:56AM
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