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*1001 $aHatton, Timothy J.$0(NO-TrBIB)98040777$_72294900
*24510$aInternationale migration in the long-run :$bpositive selection, negative selection and policy$cTimothy J. Hatton, Jeffrey G. Williamson
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2004
*300  $a37 s.$bill.
*4901 $aWorking paper series / National Bureau of Economic Research$v10529
*7001 $aWilliamson, Jeffrey G.$0(NO-TrBIB)90073233$_24958600
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