Reference | {Deposit:: BRITISH SULPHUR CORP. LTD., 1980: WORLD SURVEY OF PHOSPHATE DEPOSITS, 4TH ED., LONDO}{Deposit:: British Sulphur Corp. Ltd., 1980: World Survey Of Phosphate Deposits, 4th Ed., LondonBritish Sulphur Corp. Ltd., 1980: World Survey Of Phosphate Deposits, 4th Ed., London} |