Elwell,A.H. <br/><br/>
Soil Conservation 

 -  The College Press  1986 
<br/><br/><label>ISBN: </label>0 86925 624-6 
<br/><br/><label>LC Class. No.: </label>631.4/ELW  / 1 
<br/><br/><label>Dewey Class. No.: </label>631.4/ELW  / 1