1. Whalley, E., Jones, S. J. and Gold, L. W., eds. Papers presented at the Symposium. August1972, Ottawa. pp.pp. 161–164. Ottawa: Royal Society of Canada.
2. Whalley, E., Jones, S. J. and Gold, L. W., eds. Papers presented at the Symposium. August1972, Ottawa. pp.pp. 13–18. Ottawa: Royal Society of Canada.