International records / UK National Archives
Nigeria: Niger/Chad Boundary Commission, 1906: final corrections to traverse latitude and longitude of stations intermediate...
OS 62/60 | Ordnance Survey International Library: International Boundary Archive. Boundary Information Files. | Nigeria: Niger/Chad Boundary Commission, 1906: final corrections to traverse latitude and longitude of stations intermediate positions and Colony East Belt foot co-ordinates for selected Niger-Chad Boundary Commission traverse stations.
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