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200 1 $aVoluntary approaches to environmental protection$ethe role of legislative threats$fKathleen Segerson and Thomas J. Miceli.
210   $aMilano$cFondazione Eni$d1997.
215   $a31 p.$d21 cm
225 1 $aNote di lavoro della Fondazione ENI Enrico Mattei$v21
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700  1$aSegerson,$bKathleen$0253400
702  1$aMiceli,$bThomas J.
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