Spedding, C.R.W. <br/><br/>
An introduction to    Agricultural systems. 
C.R.W Spedding 
 - London   Applied science publishers ltd; 1979. 
<br/><br/><label>ISBN: </label>0853348235 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture.
<br/><br/><label>LC Class. No.: </label>S 493 .S64