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*24500$aGrouping in education :$ba report sponsored by the Unesco Institute for Education, Hamburg$cedited by Alfred Yates
*260  $aStockholm$bAlmqvist & Wiksell; New York, London, Wiley$c1966
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*504  $aBibliografi: s. 298-309.
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*7001 $aYates, Alfred$0(NO-TrBIB)90710207$_29645200
*7102 $aUnesco Institute for Education$0(NO-TrBIB)90136876$_12316800
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