| Reference | {Deposit:: THE ECONOMICS OF PHOSPHATE ROCK, *D ED., 1990, ROSKILL}{Deposit:: INFORMATION SERVICES LTD., P. 41.}{Deposit:: FERTILIZER INTERNATIONAL, V. 258, FEB. 1988, PP. 10-11.}{Deposit:: SULPHUR, V. 196, MAY-JUNE 1988, P. 12.}{Deposit:: PHOSPHORUS & POTASSIUM, NO. 185, P. 5 (MAY-JUNE 1993).} |