Cole, Leslie A. <br/><br/>
Investigating our world  / 
by Leslie A. Cole 
 - Toronto  :  The Macmillan ,  1970 
 - 345 p. :  ill. ;  24 cm 
<br/><br/>Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500 COL