00506 am a2200169 a 4500001001400000003000400014008004100018020001400059050002500073100002000098245005200118260004400170300001700214650004500231700003000276700003000306vtls000024560MTX000929c1976    maua          000   eng d  a08445522300aQ161.2bB646 E9 19761 aBlecha, Milo K.10aExploring Science : Gold Book /cMilo K. Blecha  aRiver Forest :bLaidlaw Brothers,c1976  a192 p :bill 0aSciencexStudy and teaching (Elementary)1 aGega, Peter C,cjt. auth.1 aGreen, Muriel,cjt. auth.