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Natural radioactivity of the tar-sand deposits of Ondo Stat..:

Fasasi, M.K. ; Oyawale, A.A. ; Mokobia, C.E....
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.  505 (2003)  1-2 - p. 449-453 , 2003