1. Shipman, P., Foster, G. & Schoeninger, M. J. Archaeol. Sci. 11, 307–325 (1984).
2. De Niro, M. J. Nature 317, 806–809 (1985).
3. Vrba, E. S. in Hominid Evolution Past Present and Future (ed. Tobias, P. V.) 195–200 (Alan R. Liss, New York, 1985).
4. Brain, C. K. et al. S. Afr. J. Sci. (in the press).
5. Grine, F. E. Proceedings of the International Symposium on the Evolutionary History of Robust Australopithecines (in the press).