Geological explorations in the Island of Celebes / by commission of the Netherlands East Indies Geological Survey in 1929 with the collaboration of W.H. Hetzel and H.E.G. Straeter, under leadership of H.A. Brouwer. Geological summary and petrology
Geological explorations in Celebes. Summary of results, by H.A. Brouwer -- Igneous and metamorphic rocks in eastern central Celebes, by W.P. de Roever -- Contribution to the petrology of the metamorphic rocks of western Celebes, by C.G. Egeler.