00407nam a2200157   450000100060000000300030000600500170000900800410002603500190006703500180008605000220010410000190012624500580014525000110020326000350021427918UR20220427183255.0061104|||||||||||||||||||||||||||||||| d  a(janium) 27907  a(janium)27905 4aLB1585b.G43 19911 aGega, Peter C.10aConcepts and experiences in elementary school science  a6a ed.  bMacmillan Publishing Co.c1991