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.
Thesis (Ph.D.) - Yale University, 1977
Rubber industry and trade--Indonesia--Sumatra Risk management--Indonesia--Sumatra