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