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200 1 $aConcentration and price-cost margins in manufacturing industries$fNorman R. Collins and Lee E. Preston.
210   $aBerkeley$aLos Angeles$cUniversity of California Press$d1968.
215   $axvi, 163 p.$cill.$d22 cm
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200 1 $aProductivity differences within the servicesector.$fde Fuchs V. e Wilburn J.
210   $aNew York$cNational Bureau of Economic Research$d1967
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