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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">A. Denny Ellerman.</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="author" lang="en_US">Wellenius, Kevin (Paul Kevin)</dim:field>
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   <dim:field mdschema="dc" element="contributor" qualifier="department">Massachusetts Institute of Technology. Department of Civil and Environmental Engineering</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2008-02-04T21:10:13Z</dim:field>
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   <dim:field mdschema="dc" element="date" qualifier="copyright" lang="en_US">1996</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">1996</dim:field>
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   <dim:field mdschema="dc" element="identifier" qualifier="oclc" lang="en_US">40519518</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering; and Thesis (M.S.)--Massachusetts Institute of Technology, Technology and Policy Program, 1996.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Includes bibliographical references.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="statementofresponsibility" lang="en_US">by Kevin Wellenius.</dim:field>
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   <dim:field mdschema="dc" element="subject" lang="en_US">Technology and Policy Program</dim:field>
   <dim:field mdschema="dc" element="title" lang="en_US">Technological progress and environmental regulation as drivers of productivity growth : evidence from the U.S. coal industry, 1972-1994</dim:field>
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   	&lt;Title>Technological progress and environmental regulation as drivers of productivity growth : evidence from the U.S. coal industry, 1972-1994&lt;/Title>
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