00670nam a2200205Ia 4500001000700000003000500007005001700012008004100029010001500070020001500085082002000100100003600120245009300156260007100249300002100320500002000341504003000361650003900391650003400430237911BIBL20160527183746.0750425s1975    njua     b    00110 eng    a 75014252   a0877780838  a371.3078bG876d10aGropper, George Leonard.2Local10aDiagnosis and revision in the development of instructional materialscGeorge L. Gropper.0 aEnglewood Cliffs, N.J.bEducational Technology Publicationsc1975.  axv, 211 p.bill.  aIncludes index.  aBibliography: p. 193-195. 0aTeachingxAids and devices.2Local 0aProgrammed Instruction2Local