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1Published 2002Subjects: “...Renewable energy sources European Union countries....”
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2Published 2007Subjects: “...Renewable energy sources United States....”
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3Published 2010Subjects: “...Renewable energy sources Technological innovations European Union countries....”
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4by Fräss-Ehrfeld, ClarisseSubjects: “...Renewable energy sources Law and legislation European Union countries....”
Published 2009
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