00412nam a2200145Ia 450000500170000000800460001703700120006304000200007504100130009508400230010810000190013124500480015026000530019830000150025120250508162018.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDLbengcFEDL  aeng2eng  a371.394, LIPqFEDL  aLipham James M 0aPrincipal and individually guided education  aReadingbAddison-Wesley Publishing Companyc1976  axvii,346p.