Lawrence, Donald B. Recent Variations in Glaciers and Closed-Basin Lakes. Indications of Climatic Change. Thirty-third John Wesley Powell Memorial Lecture, May 2nd, 1966 / Lawrence, Donald, B., and Lawrence, Elizabeth. Glacier Studies in New Zealand. In Mazama, volume 47, No. 13, pp. 17-27, December 1965 / Lawrence, Donald B. and Lawrence, Elizabeth. Response of Enclosed Lakes Current Glaciopluvial Climatic Conditions in Middle Latitude Western North America. In Annals of the New York Academy of Sciences, volume 95, article I, pp. 341-350, October 1961. - Theakstone, Wilfred (Cahiers de géographie du Québec)