| Reference | {Deposit:: INTERNATIONAL FERTILIZER INDUSTRY ASSOCIATION. PHOSPHORIC}{Deposit:: ACID TRIPLE SUPERPHOSPHATE AND AMMONIUM PHOSPHATE PLANTS}{Deposit:: 1988 SURVEY. AUGUST 1988, 39PP..}{Deposit:: BRITISH SULPHUR CORPORATION. WORLD FERTILIZER ATLAS, EIGHTH}{Deposit:: ED. APRIL 1987, 121PP.} |