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*1001 $aCollins, William J.$0(NO-TrBIB)90066126$_30737000
*24510$aHistorical perspectives on racial differences in schooling in the United States$cWilliam J. Collins, Robert A. Margo
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a51 s.$btab.
*4901 $aWorking paper series / National Bureau of Economic Research$v9770
*7001 $aMargo, Robert A.$0(NO-TrBIB)2043799$_30737100
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