environment, materials and systems / 
ministry of education and sports. 
 - Uganda :  ministry of education and sports,  c1999. 
 - ix, 287 p. ;  ill. ;  29cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>education
<br/><br/><label>Dewey Class. No.: </label>372.3  / ENV