University Illinois <br/><br/>
Bulletin : Univ. Illinois at Urbana-Champaign Coll. of Agric. Exp. Station 

 - 1991-1992 
<br/><br/> -Existencias: 1991-1992 no. 804-807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura