Precambrian sedimentary covers - Cordani, Umberto G.; Gorustovich, S. A.; Souza, A. P.; Molina, P.; Bassaget, J. P.; Feroul, J. M.; Perrin, C.; Saggerson, E. P.; Turner, L. M.; Pillement, P. (Correlation of uranium geology between South America and Africa, 1986)