Food and Agricultur Organization  <br/><br/>
Soil : conserving the soil impraving the soil 

 - Rome  Food and Agricultural Organization of the United Nations  1970 
 - 29p.; 22cm.- 
 - Better farming series; no.10 .
<br/><br/> reprinted 1972 
<br/><br/><label>Dewey Class. No.: </label>581.5  / FAO