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The geology of Southern Mengo : explanation of sheet North A-36/U and part of sheet North A-36/V
Pallister, J. W., (1959)
Nigéria földtana, ásványi nyersanyagai és bányászata
Lakos, Károlyné, (1985)
Geology and mineral resources of the Philippines
(1981)
Minerals and industry in Tanganyika
Bisset, C. B., (1955)