Matches in Library of Congress for { ?s ?p Energy in the twenty-first century. }
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- 2006296817 alternative "Energy in the twenty-first century".
- 2012418302 alternative "Energy in the twenty-first century".
- 2013431020 alternative "Energy in the twenty-first century".
- 2006296817 title "Energy in the twenty-first century".
- 2012418302 title "Energy in the twenty-first century".
- 2013431020 title "Energy in the twenty-first century".