Technology and productivity changes in US coal mining: a 45-year review
Mining Engineering
, 1999, Vol. 51, No. 11, pp. 0-8
Darmstadter, Joel
PREVIEW:
The position of the coal industry in America’s fuel and power picture remains one of prime importance. Measured in Btu terms, the industry is the country’s leading energy producer and an important exporter. Foreign coal sales yield annual proceeds of about $4 billion.
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