Isabella Lucy Bird Bishop, The Golden Chersonese and the Way Thither… (1883)
“ The wealth of Selangor lies in its apparently inexhaustible tin mines. The range of hills which forms the backbone of the Malay Peninsula rises in places to a height of seven thousand feet, and it is from this range that the alluvial detritus is washed down, beneath which is deposited the layer of ore or wash, which varies from four inches to ten feet in thickness. ”
