Llewelyn , Richard Von <br/><br/>
Optimal cropping combinations :  economic analysis of food crop production in Madiun , Indonesian  [microform] / 
Richard Von Llewelyn 
 - Ann Arbor, Mich. :  University Microfilms International,  1996 
 - 3 microfisches ;  11x 15 cm. 
<br/><br/>Thesis (Ph.D) - Kansas State University , 1995