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

PETROLOGY AND ORIGIN OF PHOSPHORITES.EMIGH GD.1967; ANATOMY.OF.THE.WESTERN.PHOSPHATE.FIELD.EDITED.BY.L.H.HALE.; 1967, P. 103 A 114Miscellaneous

Y-A-T-IL SUFFISAMMENT DE RESERVES DE PHOSPHATE DANS LE MONDE.EMIGH GD.sdS. L. TRAD. DE L'ANGL.: ENGNG MING J., G.B., 1972, NO 4 ?; , NUM. 0607, P. 1Miscellaneous