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Hydrocarbon source rock potential of the Karoo in Zimbabwe Influence of palaeotopography on the distribution of coal in the Western Coalfield, Sydney basin, Australia: comparison with South African coals A. C. HUTTON and A. J. MANDILE 61 Quantitative XRD measurement of mineral matter in Gondwana coals using the Rietveld method M. L. N. KAGYA 73 Geochemical characterizaton of Triassic petroleum source rock in the Mandawa basin, Tanzania N. G. OBAJE, I. I. FUNTUA, B. LIGOUIS and S. I. ABAA 89 Maceral associations, organic maturation and coal-derived hydrocarbon potential in the Cretaceous Awgu Formation,
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## Aims and Scope The Journal of' Africa Eurfh Sciences is an international mterdisctplinary ~ournai devoted to all aspects of research related to the African continent and neighbouring regions. Papers incorporating the results of research on regional geology of the African cratons and mobile belt