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200 1 $aMental ability and higher educational attainment in the 20th century$ea technical report prepared for the Carnegie commission on higher education$fby Paul Taubman and Terence Wales
210   $aBerkeley$cCarnegie commission on higher education$dİ1972
215   $a47 p.$d26 cm
225 1 $aOccasional paper$fNational bureau of economic research$v118$aStati Uniti d'America$b: National bureau of economic research$3IT\ICCU\MILV\005593
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701  1$aWales,$bTerence$0252129
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