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*1001 $aSherman, J. Gilmour$qJohn Gilmour$0(NO-TrBIB)90612375$_109491000
*24514$aThe personalized system of instruction$cJ. Gilmour Sherman and Robert S. Ruskin
*260  $aEnglewood Cliffs, N.J.$bEducational Technology Publications$c1978
*300  $axi, 114 s.
*4901 $aThe Instructional design library$vv. 13
*650 0$aIndependent study$_36098800
*7001 $aRuskin, Robert S.$0(NO-TrBIB)4069340$_109491100
*830 4$aThe Instructional design library$vv. 13$_33143100
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