Burns, John Joseph <br/><br/>
The Management of risk  social factors in the development of exchange relations among the rubber traders of North Sumatra /  [microform] : 
by John Joseph Burns 
 - Ann Arbor, Mich. :  University Microfilms International,  1978 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - Yale University, 1977 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rubber industry and trade--Indonesia--Sumatra<br/>Risk management--Indonesia--Sumatra