Looking after the soil. 

 - Rev. ed. 
 - Port Moresby  Dept. of Primary Industry  1977. 
 - 16 p.  ill.  30cm. 
 - Farming notes  1. .
<br/><br/> Cover title. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plant-soil relationships.<br/>Soil ecology.