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A hand-drawn plan for improvements to the pier at the port in Batavia (Jakarta), showing profiles of stone and concrete walls/buttresses to be built along the sides of the ‘Haven Kanaal [Harbour Canal]’. Blue lines on the profiles mark water level.

Map of the bay at Bengkoelen (Bengkulu, west coast of Sumatra), with bathymetry (sea depth), islands, shoals and reefs marked. Two lighthouses are shown, with lines to indicate the limits of their range.

Map of the bay at Bengkoelen (Bengkulu, west coast of Sumatra), with bathymetry (sea depth), islands, shoals and reefs marked. Two lighthouses are shown, with lines to indicate the limits of their range.