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100   $a20030910d1957----km-y0itay50------ba
101 0 $aeng
102   $aUS
200 1 $aEconomic concentration and the monopoly problem$fEdward S. Mason
210   $aCambridge (Mass.)$cHarvard University Press$d1957
215   $aXVI, 411 p.$d22 cm
225 1 $aHarvard economic studies$v100
610 0 $aGrandi imprese
610 0 $aImprese$aConcentrazione
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700  1$aMason,$bEdward S.$f<1899-1992>$0109065
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952   $aXV C 31 (100)$b52369$fFGBC
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996   $aEconomic concentration and the monopoly problem$9515095
997   $aUNINA