| Reference | {Deposit:: BRITISH SULPHUR CORP. LTD., 1980: WORLD SURVEY OF PHOSPHATE DEPOSITS, 4TH ED., LONDON}{Deposit:: OUSSEDIK, M. ET AL., 1979: LES MINERALISATIONS PHOSPHATES EOCENES EN ALGERIE..., DOCUMENTS DU BRGM, NO.24, 1980, ORLEANS}{Deposit:: SERMI, 1963: GISEMENT DE PHOSPHATE DE CHAUX DE DJEBEL ONK, 50 P.}{Production:: BRITISH SULPHUR, CORP. LTD., 1980: WORLD SURVEY OF PHOSPHATE DEPOSITS, 4TH ED., LONDON} |