00561nam a2200181Ia 450000500170000000800410001724500480005870000210010626000430012730000180017030000110018849000290019902000250022865000450025365000420029805000240034054600150036420260803094148.0251212s2000    xx            000 0 und d1 aDiscovery works: bscience workbook grade 40 aHoughton Mifflin  aBoston, MA :bHoughton Mifflin,c2000.  a36 p.: bill.  c27 cm.  aHoughton Mifflin Science  a13:978-0-618-02843-6  aSciencexStudy and teaching (Elementary)  aPhysical sciencesxStudy and teaching  a500 H81d c2000 Gr.4  ain English