Concepts of Conservation :  A Guide to Discussion of Some Fundamental Problems / 
The Conservation Foundation. 
 - New York :  The Conservation Foundation,  1963. 
 - 64 p. ;  23 cm. 
<br/><br/><br/>Inglés 
<br/><br/><label>ISBN: </label> Normal 
<br/><br/><label>Subjects--Index Terms: </label>Conservation Conservación Natural resources Recursos naturales 
<br/><br/><label>Dewey Class. No.: </label>333.72