Edwards, Clive A. ed <br/><br/>
Sustainable agricultural systems 

 - Iowa  Soil and water conservation society  1990 
 - 696 p. 
<br/><br/><label>ISBN: </label>093573421-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sustainable agricultural, Agricultural systems
<br/><br/><label>Dewey Class. No.: </label>502.131.1:631 E31S