00416nam a2200109Ia 4500008004100000020001700041040002900058050002500087100002100112245013100133260004200264230222s9999||||xx |||||||||||||| ||und||  a9966-830-009  cChuka University Library  aTHE QD 40 bA75 2012  aArimba Antony M. 0aEffects of advance organizers on secondary school students' achievement and self concept in Chemistry in Maara district, Kenya  aChuka University CollegebChukac2012