Joan Davidson <br/><br/>
Conservation and agriculture 

 - New York  John Wiley & Sons  1977 
 - 252p 
<br/><br/>Joan Davidson & Richard Lloyd: Conservation and agriculture.  New York.  John Wiley & Sons, 1977. 0-471-99502-9--(630.2DAV)   
<br/><br/><br/>ENGLISH 
<br/><br/><label>ISBN: </label>0-471-99502-9 
<br/><br/><label>Dewey Class. No.: </label>630.2  / DAV