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Beneficiation Practice For Rock Phosphate On Syrian Ore

[4] J.E. Lawver, Ore Beneficiation Method US Patent 2723029 November 1955 [5] J.E. Lawver, Beneficiation of Non metallic minerals. US Patent 2,754,965 July 1956 [6] J.E. Lawver, Beneficiation of Phosphate Ores US Patent 3,225,923 Dec 1965 [7] C. C. Cook, Beneficiation Method and Apparatus Therefore, United States Patent 2,738,067, March, 1956.

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