| Reference | {Deposit:: HARRINGTON,J.F., WARD,DE, ET AL, 1966, SOURCES OF FERTILIZER}{Deposit:: IN SOUTH AMER.: A PRELIM. STUDY: USGS BULL 1240.}{Deposit:: MCKELVEY, V.E., 1967, PHOSPHATE DEP.:USGS BULL 1252-D.}{Deposit:: NOYES DEVEL. CORP., 1963, INTER. FERT. GUIDE.}{Deposit:: THE BRITISH SUL. CORP., LTD.,1964, A WORLD SURV. AT PHOS. DE}{Deposit:: ED., 206PP.}{Deposit:: TUTTLE,O.F., AND GITTINS,J., CARBONATITES: INTERSCIENCE PUB.}{Deposit:: WILEY & SONS, N.Y.} |