Basic technics in ecological farming  papers presented at the 2nd international conference held by the IFOAM, Montreal, October 1-5, 1978 The Maintenance of soil fertility : exposes presentes a la 3 eme conference internationale organisee par IFOAM, Bruxelles, du 3 au 5 Septembre 1980 
edited by Stuart Hill, Pierre Ott 
 - Basel, Switzerland  Birkhauser Verlag  1982 
 - 365 p.  ill.  24 cm. 
<br/><br/> English and French 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Organic farming<br/>Agricultural ecology<br/>Agriculture<br/>Soil fertility
<br/><br/><label>Dewey Class. No.: </label>631.5  / 84