1. Heusser, C. J., in World Climate from 8000 to 0 B. C. (edit. by Sawyer, J. S.), 124 (Royal Meteorological Society, 1966).
2. Flint, R. F., Glacial and Quaternary Geology (Wiley, New York, 1971).
3. van Zinderen Bakker, E. M., sen., in Palaeoecology of Africa and of the Surrounding Islands and Antarctica, 5 (Balkema, Cape Town, 1969).
4. de la Rüe, E. Aubert, Comité National Français des Recherches Antarctiques, No. 10, Biologie, 1, 1 (1964).
5. Schalke, H. J. W. G., and van Zinderen Bakker, E. M., sen., in Marion and Prince Edward Islands (edit. by van Zinderen Bakker, E. M., et al.), 89 (Balkema, Cape Town, 1971).