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*24500$aEducational costs and productivity :$bcontributions to a seminar for professors of educational planning (economics) of the regional centres of Unesco, held at the International Institute for Educational Planning, 5-16 June 1967$cselected by Jacques Hallak
*260  $bUnesco; International Institute for Educational Planning$c1967
*300  $a1 b. (flere pag.)
*650 0$aEducation$xCosts$_24832600
*650 0$aEducational planning$_25832100
*7001 $aHallak, Jacques$0(NO-TrBIB)90288519$_39697000
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