| Reference | {Deposit:: HARBEN, P.W., AND BATES, R.L., 1990, PHOSPHATE ROCK, IN INDUSTRIAL MINERALS GEOLOGY AND WORLD DEPOSITS: LONDON, INDUSTRIAL MINERALS DIVISION METAL BULLETIN PLC, P. 190-204.}{Deposit:: CHENEY, T.M., MCCLELLAN, G.H., AND MONTGOMERY, E.S., 1979, SECHURA PHOSPHATE DEPOSITS, THEIR STRATIGRAPHY, ORIGIN, AND COMPOSITION: ECONOMIC GEOLOGY, V. 74, NO. 2, P. 232-259.}{Deposit:: KRAUSS AND OTHERS, 1984, INTERNATIONAL STRATEGIC MINERALS INVENTORY SUMMARY REPORT--PHOSPHATE: U.S. GEOLOGICAL SURVEY CIRCULAR 930-C, 41 P.} |