| Reference | {Deposit:: HOOD,J.C.,KORPERSHOEK,H.R.PROVING RESERVES AND MINE}{Deposit:: PLANNING OF THE PEBBLE DEPOSITS AT CASSINGA IRON ORE MINES,}{Deposit:: ANGOLA.TRANS.INST.MIN.MET.V.77,JULY 1968,SEC.A.PP.89-102.}{Deposit:: U.N.1970.SURVEY OF WORLD IRON ORE RESOURCES.DEPT.}{Deposit:: OF ECON.&SOC.AFFAIRS.N.Y.} |