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*1001 $aHarrigan, James$0(NO-TrBIB)2057755$_31102600
*24510$aSpecialization and the volume of trade :$bdo the data obey the laws?$cJames Harrigan
*260  $aCambridge, Mass.$bNBER$c2001
*300  $a56 s.$bill.
*4901 $aNBER working paper series$v8675
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v8675$w999105437124702201$_13074900
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^