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Liberia | |
| Axelrod, J. M., Carron, M. K., Milton, C., Thayer, T. P. (1952) Phosphate mineralization at Bomi hill and Bambuta, Liberia, west Africa. American Mineralogist, 37 (11-12) 883-909 |
| Rosenblum, Sam, Srivastava, S.P. (1979) The Bambuta phosphate deposit, Liberia; a reconnaissance report. Bulletin Vol. 1480. US Geological Survey doi:10.3133/b1480 Axelrod, J. M., Carron, M. K., Milton, C., Thayer, T. P. (1952) Phosphate mineralization at Bomi hill and Bambuta, Liberia, west Africa. American Mineralogist, 37 (11-12) 883-909 a reconnaissance report. USGS Bulletin 1480 |
| Berge, J.W. (1974) Geology, Geochemistry, and Origin of the Nimba Itabirite and Associated Rocks, Nimba County, Liberia. Economic Geology, 69:1, 80-92. |