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*1001 $aBroadberry, Stephen N.$0(NO-TrBIB)3014279$_33667000
*24510$aLabor productivity in the United States and the United Kingdom during the nineteenth century$cStephen N. Broadberry, Douglas A. Irwin
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2004
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*4901 $aWorking paper series / National Bureau of Economic Research$v10364
*7001 $aIrwin, Douglas A.$0(NO-TrBIB)90556188$_33667100
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