00413nam a2200157Ia 450000500170000000800460001703700120006304000200007504100130009508400190010824500370012724500580016426000090022230000120023165000120024320250508161546.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDLbengcFEDL  aeng2eng  a574, NCEqFEDL 0aImproving instruction in biology 0cNational Council of Educational Research and Training  c1969  aix,77p.  aBiology