1. 1976 Palynological evidence for an important change in the vegetation of the Omo Basin between 2.5 and 2 million years ago. In: Earliest Man and Environments in the Lake Rudolf Basin. et al., eds. University of Chicago Press, Chicago.
2. Hominid taphonomy: Transport of human skeletal parts in an artificial fluviatile environment
3. 1972 Radiometric dating of sedimentary formations in the lower Omo Valley, Ethiopia. In: Calibration of Hominoid Evolution. and , eds. Scottish Academic Press, Edinburgh, pp. 273-287.
4. and 1976 Observations on problems of correlation of late Cenozoic hominid-bearing formations in the north Rudolf basin. In: Geological Background to Fossil Man in Africa. ed. Geological Society of London, in press.