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A map of the watershed of the Bila and Pane rivers in northern Sumatra. In addition to many rivers/tributaries, mountains, roads, paths and administrative borders are marked. Side views of mountains (elevations) are shown to use a landmarks.

A geological map, spread over eight sheets, showing the types of rock and minerals found in the Oembilien coalfield, in the Padang Highlands on Sumatra’s west coast. There are also additional geological profiles.