Geological report on the Coal-occurence in the Mining Concessions "SUKAMARINDA" and "BUNIAN" and the Coalfield "AYER SERILLO", Residency palembang.
the survey started in june, 1917, and was suspended on the 15th of february, 1918, due to illness, on account of which the survey of the concession "Boenian" could not entirely be completed