Productivity of world ecosystems ; proceedings of a symposium... 

 - Washington :  NAS,  1975 
 - 166 p.  : ilus. ; gráfs. 
<br/><br/><label>LCCN: </label>30260 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecosistema.<br/>Medio ambiente.
<br/><br/><label>Dewey Class. No.: </label>581.5  / N38