Simmons, Ian Gordon. <br/><br/>
Resource systems / 
by Ian and Carol Simmons. 
 - London :  MacMillan,  1974. 
 - 48p. :   ill., maps ;  22cm. 
 - Aspects of geography. .
 - Aspects of geography.   .
<br/><br/>Bibliograhpy.: p.48. 
<br/><br/><label>ISBN: </label>0333152468 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources.