Wijewardena, Ray <br/><br/>
Conservation farming :  system, techniques and tools / 
Ray Wijewardena and Parakrama  Waidyanatha. 
 - Colombo :  Marga Publications,  1989. 
 - 38 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Farming
<br/><br/><label>Dewey Class. No.: </label>631.3  / WIJ