Multiple cropping systems / 
Charles A. Francis ... [et al.] 
 - New York :  Macmillan,  1986 
 - xiv, 383 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0029486106 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Multiple cropping systems