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*24500$aDistance learning and evaluation$ced. for the Association for Educational and Training Technology by Fred Percival and Henry Ellington ; general editor: A.J. Trott
*260  $aLondon$bKogan Page$c1981
*300  $a334 s.$bill.
*4901 $aAspects of educational technology$v15
*7001 $aEllington, Henry$0(NO-TrBIB)90274860$_35809700
*7001 $aPercival, Fred$0(NO-TrBIB)90274859$_35810000
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