Organic farming :   Current Technology and Its Role in a Sustainable Agriculture 

 - Madison, Wisconsin:   American Society of Agronomy \ Crop Science Society of America \ Soil Science Society of America,   1990 
 - 192p. 
<br/><br/> Incluye prefacio y contenido 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AGR<br/>COSECHA<br/>CULTIVOS
<br/><br/><label>Dewey Class. No.: </label>631.5 O68