Casada, James Allen, 1942- The imperialism of exploration British explorers and East Africa, 1856-1890 / [microform] : by James Allen Casada - Ann Arbor, Mich. : University Microfilms International, 1973 - 1 microfilm reel : positive ; 35 mm. Thesis (Ph.D.) - Vanderbilt University, 1972 Subjects--Geographic Terms: Africa, East--Description and exploration