Donahue, Roy Luther, <br/><br/>
Our soils and their management :  increasing production through environmental soil and water conservation / 
Roy Luther Donahue ; Roy H. Follett ; Rodney W. Tulloch 
 - 5th ed. 
 - Danville, Ill. :  Interstate Printers & Publishers,  1983. 
 - xv, 622 p. :   ill. ;  27cm