July-September 1998 Issue
References:
"Coal-Mining Productivity: National Aggregates Conceal Large Differences"
-
Ellerman, A., T. Stoker, and E. Berndt. Sources of Productivity Growth in
the American Coal Industry. March 1998. Center for Energy and Environmental
Policy Research Working Paper No. MIT-CEEPR 98-004WP. 66 pages.
(http://web.mit.edu/ceepr/www/wpabstracts.html#1998:)
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