Wit Thiengburanathum, 1943- An analysis of Thai opium production [microform] / by Wit Thiengburanathum - Ann Arbor, Mich. : University Microfilms International, 1976 - 1 microfilm reel : positive ; 35 mm. Thesis (Ph.D.) - University of Iowa, 1976 ISBN: Y910040387 Subjects--Topical Terms: Opium trade--Thailand