00346nam a2200145Ia 4500008004100000020001500041082001400056100001600070245001600086260004200102300000800144650001400152650002000166653001400186170901s1973    xx            000 0 und d  a0460095455  a371bS34O  aSharp, John 0aOpen School  aLondonbJ.M. Dent and Sons Ltd.c1973  a132  aEducation  aSocial sciences  aEducation