Cox, Joseph F. <br/><br/>
Cropmanagement and soil conservation/ 
Joseph F. Cox 
 - New Yourk :  John Wiley,  1948 
 - xxii, 572 p. :  ill. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops--United States<br/>Soil Management--United States