au.\*:("EMIGH GD")
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ECONOMIC PHOSPHATE DEPOSITS.EMIGH GD.1973; IN: ENVIRON. PHOSPHORUS HANDB.; NEW YORK JOHN WILEY AND SONS,1973, P. 97 A 116Book
WORLD PHOSPHATE RESERVES. ARE THEY REALLY ENOUGH.EMIGH GD.1972; ENGNG MING J.; USA; 1972, VOL. 173, NUM. 0004, P. 90 A 93Miscellaneous
