00333nam a2200109Ia 4500008004100000040002500041082001200066100005000078245005100128260003600179300000800215230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a370 G86  aGregorio, Herman C.  and Cornelia M. Gregorio 0aPrinciples of elementary- secondary education   bR.P. Publishing Co., Inc.c1989  a244