Spedding, C. R. W. (Colin Raymond William) <br/><br/>
An introduction to agricultural systems 
C. R. W. Spedding 
 - London  Applied Science Publishers  1979 
 - ix,169 p. : ill. ; 23 cm. 
<br/><br/>Bibliography P.162- p.166 
<br/><br/><label>ISBN: </label>0853348235 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture