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von Knorring O, Condliffe E 1987. Mineralized pegmatites in Africa. Geological Journal, Supplement: Thematic Issue 22 (S2) 253-270
von Knorring O 1985. Niobium and tantalum minerals. Communications of the Geological Survey of South West Africa/Namibia 1 85-88
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von Knorring O, Franke W 1987. A preliminary note on the mineralogy and geochemistry of the Aris Phonolite, SWA/Namibia. Communications of the Geological Survey of South West Africa/Namibia 3 65

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