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*24504$aThe pace of progress at superfund sites :$bpolicy goals and interest group influence$cHilary Sigman
*260  $aCambridge, Mass.$bNBER$c2000
*300  $a36 s.
*4901 $aNBER working paper series$v7704
*7001 $aSigman, Hilary$_13780200
*7102 $aNational Bureau of Economic Research (Forente Stater)$_13074800
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