| Reference | {Deposit:: THE BRITISH SULPHUR CORP. LTD., 1980: WORLD SURVEY OF PHOSPHATE DEPOSITS, 4TH ED., LONDON}{Deposit:: LEE, ANABELLE, I.N., (EDITOR), 1980: FERTILIZER OCCURRENCES IN THE ASIA-PACIFIC REGION, EAST-WEST RESOURCES SYSTEME INSTITUTE, HONOLULU} |