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Geological map of the Minahasa Peninsula, Celebes (Sulawesi) showing rock types. Two more topographical maps show the terrain of the northeast tip of the peninsula, with elevation views including of the volcano Mount Klabat.

Map of routes to and around Lake Poso, central Celebes (Sulawesi) by the Dutch missionary and ethnographer Albert Christian Kruyt. The legend records types of rocks found at points along the route.

Four maps of areas with lakes in Celebes (Sulawesi), including the lakes and main watershed of the South Peninsula. Three of the maps feature cross-section views (elevations) which show types of rocks.