Duffey, Eric <br/><br/>
Conservation of nature / 
Eric Duffey 
 - London :  Collins,  1970 
 - 128 p. :  ill. (part col.) ;  26 cm. 
<br/><br/>Bibliography: p. 126. 
<br/><br/> Describes how man through farming, industry, clearance of forests, and population growth began to change the earth and bring about critical shortages of natural resources. 
<br/><br/><label>ISBN: </label>0070180156 
<br/><br/><label>LCCN: </label>79-119819 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conservation of natural resources--Juvenile literature