Airriess, Christopher Anderson. A port systems in a developing regional economy evolution and response in North Sumatra, Indonesia / [microform] : Christopher Anderson Airriess. - Ann Arbor, Mich. : University Microfilms International, 1990. - 3 microfiches ; 11 x 15 cm. Thesis (Ph. D.) - University of Kentucky, 1989. Subjects--Topical Terms: Harbors--Indonesia.