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*24500$aContemporary research on teacher effectiveness$cBruce J. Biddle, William J. Ellena, editors
*260  $aNew York$bHolt, Rinehart and Winston$cc1964
*300  $aXIII, 352 s.$bill.
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*7001 $aEllena, William J.$0(NO-TrBIB)97039309$_102892700
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