00450nam a2200169Ia 450000500170000000800460001703700120006304000200007504100130009508400230010810000150013124500460014626000480019230000140024036500150025454600110026920250508164546.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDLbengcFEDL  aeng2eng  a371.102, OLSqFEDL  aOlson John 0aUnderstanding teaching : Beyond expertise  aMilton Keynes bOpen University Pressc1992  axiv,103p.  aGBPb12.99  aMACESE