The first investigations of the coal formation on the island of pulau laut were carried out by mining-engineer C.DE Groot on Account of a report published in 1850 by the architect of the engineers corps W. IHNE.
The first investigation of the coal formation on the island of pulau laut were carried out by mining-engineer C.DE GROOT, on account of a report published in 1850 by the architect of the engineering corps W.IHNE.