Spedding, C. R. W <br/><br/>
The biology of agricultural systems / 
C. R. W. Spedding 
 - London  Academic Press,  1975 
 - ix, 261 p. :  ill. ; 24 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0126565503 
<br/><br/><label>LCCN: </label>74-018505 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural systems<br/>Biology, Economic