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- [12] NOTES ON THE WAGOGO OF GERMAN EAST AFRICA JOURNAL OF THE ROYAL ANTHROPOLOGICAL INSTITUTE OF GREAT BRITAIN AND IRELAND, 1902, 32 : 305 - 338
- [16] Regarding the Acquisition of German East Africa PETERMANNS MITTEILUNGEN, 1909, 55 (12): : A65 - A65
- [17] The colony as laboratory: German sleeping sickness campaigns in German East Africa and in Togo, 1900-1914 HISTORY AND PHILOSOPHY OF THE LIFE SCIENCES, 2002, 24 (01): : 69 - 89
- [18] During the War in German East-Africa and South Africa PETERMANNS MITTEILUNGEN, 1917, 63 : 355 - 356
- [20] The German East African Society, Contribution to the Problem of Protective Societies and to the History of German East Africa ARCHIV FUR SOZIALWISSENSCHAFT UND SOZIALPOLITIK, 1914, 38 (01): : 250 - 250