በኢትዮጵያ ስለአፈር ልማትና ጥበቃ ዘዴ  

 -  1979 
 - 103 
<br/><br/><label>LC Class. No.: </label>631.4/SOI  / 5 
<br/><br/><label>Dewey Class. No.: </label>631.4/SOI  / 5