Arimba, Antony Mugiira Effects of advance organizers on secondary school students' achievement and self concept in Chemistry in Maara district, Kenya - Chuka, Kenya Chuka University 2012 - 69 leaves ISBN: 9966-830-009 Subjects--Topical Terms: 1. Chemistry---study and teaching (secondary) LC Class. No.: THE QD 40 / .A75 2012