Harper, F. <br/><br/>
Principles of arable crop production / 
F. Harper 
 - London :  Granada ,  1983 
 - viii, 336 p. :  ill. ;  24 cm . 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0246117419 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crop<br/>Crop