Christopher, Jack H. <br/><br/>
Exploring the natural world :  teacher's manual / 
by Jack H. Ch ristopher. 
 - Ontario :  D.C. Heath Canada Ltd,  1980. 
 - 183 p. :  ill. ;  23 cm. 
 - Focus on science. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500