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BRITISH SULPHUR, WORLD SURVEY OF PHOSPHATE DEPOSITS, 1973AND 1980 EDITIONS.PERSONAL FILES OF E. PELITTI (CONFIDENTIAL).PHOSPHORUS/POTASSIUM, NO. 91, SEPT. 10, 1977.DORR-OLIVER, I.V.P. RIECITO MINE, EVALUATION OF RESERVES.PROJECT NO. 20312, JUNE 9, 1969.SANTELIZ, H. EVALUATION OF THE PHOSPHATE ROCKS ATRIECITO (SPAN.): M.H.H., DIR.GEOL., C.G.V., 4TH, PUB.ESP. 5, VOL. 5, 1972, PP. 2773.MINERALS, APRIL 1977, P. 41.PONTE, C. AND OTHERS. THE RIECITO PHOSPHATE DEPOSIT !SPAN^.M.M.H., DIR. GEOL., 3RD. VEN. GEOL. CON., PUB. ESP.NO. 3, VOL. R, 1961, PP. 1641-1660INTERNATIONAL MINING, AUGUST 1987, PP. 166-167.MINING ANNUAL REVIEW, 1987, P. 236.VISIT TO REICITO BY U.S. BUREAU OF MINES COMMODITY SPECIAL-IST, TRIP REPORT, AUGUST 30, 1988.BRITISH SULPHUR, WORLD SURVEY OF PHOSPHATE DEPOSITS, 1980.RODRIGUEZ, SIMON E., "RECURSOS MINERALES DE VENEZUELA",BOLETIN DE GEOLOGIA, DICIEMBER, 1986, PP. 115-129.BRITISH SULPHUR CORPORATION, WORLD SURVEY OF PHOSPHATEDEPOSITS, FIFTH ED., 1987, P. 83.