Spedding, C.R.W.,  <br/><br/>
An introduction to agricultural systems / 
C.R.W. Spedding 
 - London :  Applied Science Publishers,  1979 
 - vii, 169 pages :  illustration ;  22cm 
<br/><br/>Includes bibliogrpahical reference and index  
<br/><br/><label>ISBN: </label>085334823 (paperback) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems
<br/><br/><label>LC Class. No.: </label>S493 S64