Towards sustainable crop production systems emerging technologies, 1 st to 7th July, 1992. 

 - London :    The Royal International Agricultural Exhibition,    1992 . 
 - 86 p. :    ill. ;    30 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Cropping systems.
<br/><br/><label>Dewey Class. No.: </label>338.1 TOW