Fertilizers - An annual review of world production, consumption, trade and prices, 1968

abonos abonos potasicos azote azufre comercio commerce consommation consumo consumption engrais engrais potassique fertilizers fosfatos (sales) industria industrie industry monde mundo nitrogen phosphate (sel) phosphates (salts) potash fertilizers precio al por mayor precio al productor precios prices prix prix de gros producer prices production production data soufre sulphur trade wholesale prices world