RUTTEN, L. & C.J. RUTTEN-PEKELHARING, De omgeving der Balikpapan-Baai. Taken from:"TAG", Tweede Serie, vol. XXVIII (1911).
Leiden, E.J. Brill, 1911 recent wraps. with new endpapers. [22]pp. (page 579-601). With a fold. col. lithogr. sketch-map, with legenda (geolog. profiles and geolog. review of surroundings of Balikpapan-Bay), lithographed by Muller & Zn., Leiden, extensive footnotes.
A description of the geology, geography and botany of the surroundings of Balikpapan-Bay, East Coast dutch territory of Borneo, after the original confidential report submitted to the "Nederlandsche Maatschappij tot het verrichten van Mijnhouwkundige Werken". The presence of mineral deposits (oil) have been suppressed by order of the company. Good copy.