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*1001 $aClark, Ximena$0(NO-TrBIB)2043045$_73784300
*24510$aWhere do U.S. immigrants come from, and why?$cXimena Clark, Timothy J. Hatton, Jeffrey G. Williamson
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2002
*300  $a41 s.
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*7001 $aHatton, Timothy J.$0(NO-TrBIB)98040777$_72294900
*7001 $aWilliamson, Jeffrey G.$0(NO-TrBIB)90073233$_24958600
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