1. Botha, B.J.V., Grobler, N.J. and Burger, A.J., in press. New U-Pb age-measurements on the Koras Group, Cape Province, and its significance as a time-reference horizon in eastern Namaqualand. Trans. Geol. Soc. S. Afr.
2. Paleomagnetic reconnaissance of the Koras Group, eastern Namaqualand;Briden,1975
3. Radiometric age measurements on rocks from southern Africa to the end of 1971;Burger;Geol. Surv. S. Afr. Bull.,1973
4. Age determinations April 1972 to March 1974;Burger;Ann. Geol. Surv. S. Afr.,1975
5. Confidence limits for the precision parameter κ;Cox;Geophys. J.R. Astron. Soc.,1969