USGS Open-File Report 2011-1058, data
2011-5-27 · Santos-Ynigo, L., 1964. Distribution of iron, alumina and silica in the Pujada laterite of Mati, Davao Province, Mindanao Island, Philippines: 22nd International Geological Congress Proceedings, part 14, p. 126–141. Sun Star Davao, 2008, Nickel mining firm barred in Davao Oriental: Mines and Communities, 5 p.,