00682cam a2200193 a 450000500170000000800410001702000150005802000150007304000260008808200230011424501190013726000380025630000360029450400290033065000420035965000420040170000190044370000260046220241205145217.0790405s1978    enka     bd   000 0 eng    a0313209219  a0333185501  aLCbengcLCdBD-DhBPA04a371.3078bENC 197804aThe Encyclopaedia of educational media communications and technology /c[edited by] Derick Unwin and Ray McAleese.  aLondon :bMacmillan Press,c1978.  axviii, 800 p. :bill. ;c24 cm.  aIncludes bibliographies. 0aAudio-visual materialsxDictionaries. 0aEducational technologyxDictionaries.1 aUnwin, Derick.1 aMcAleese, Ray,d1944-