No. 26, Jasin & Umba Valley boundary : map annexed to arrangement between Great Britain and Germany, January, April, 1900 (no. 278, page 921) / Ordnance Survey.
Jasin & Umba Valley boundary, no. 26 Map annexed to arrangement between Great Britain and Germany fixing the boundary at Jassin and in the bend of the Umba River, East Africa No. 26, Jasin and Umba Valley boundary
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