1. Leakey, M. D. & Hay, R. L. Nature 278, 317–323 (1979).
2. Findlater, I. C. in Koobi Fora Research Project Vol. 1 (eds. Leakey, M. G. & Leakey, R. E.) 14–31 (Clarendon, Oxford, 1978).
3. Vondra, C. F. & Bowen, B. E. in Geological Background to Fossil Man (ed. Bishop W. W.) 395–414 (Scottish Academic, Edinburgh, 1978).
4. Findlater, I. C. in Earliest Man and Environments in the Lake Rudolph Basin (eds Coppens, Y., Howell, F. C., Isaac, G. LI. & Leakey, R. E. 94–104 (University of Chicago Press, 1976).
5. Fitch, F. J. & Miller, J. A. in Earliest Man and Environments in the Lake Rudolph Basin (eds Coppens, Y., Howell, F. C., Isaac, G. LI. & Leakey, R. E.) 123–147 (University of Chicago Press, 1976).