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*24500$aCommunication and learning$cedited for the Association for programmed learning and educational technology by Jon Baggaley, G. Harry Jamieson, Harry Marchant
*260  $aLondon$bPitman Publ.$c1975
*300  $aX, 371 s.$bill.
*4901 $aAspects of educational technology$v8
*7001 $aBaggaley, Jon$0(NO-TrBIB)2132748$_42355700
*830  $aAspects of educational technology$x0141-5956$v8$w998641671644702201$_13391000
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