Basic technics in ecological farming :  papers presented at the 2nd international Conference held by the IFOAM, Maintenance of soil fertility / 
edited by Stuart Hill, Pierre, Ott. 
 - Basel :  Birkhauser Verlag,  1982. 
 - 365 p. :  ill. ;  24 cm. 
<br/><br/> English and French. 
<br/><br/>Includes bibliographies. 
<br/><br/> Open access. 
<br/><br/><label>LCCN: </label>8214636  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Organic farming--Congresses.<br/>Agricultural ecology--Congresses.<br/>Agriculture--Congresses.