Botkin, Daniel B Keller, Edward A <br/><br/>
Environmental studies  the earth as living planer 

 - Columbus  Charles E Merrill publishing company  1982 
 - ix, 506p.; ill, 30cm. 
<br/><br/><label>ISBN: </label>675098130 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biosphere<br/>Ecosystems<br/>Environmental economics<br/>Environmental ethics<br/>Environmental law<br/>Environmental planning<br/>Human population