1. 1986b. Great Lakes Degree-day and Winter Severity Index Update: 1897–1983, NOAA Data Report ERL GLERL-29, Great Lakes Environmental Research Laboratory, Ann Arbor, MI, 54 pp.
2. 1989. ‘Impact of global warming on Great Lakes ice cycles’, in and (eds), The Potential Effects of Global Climate Change on the United States, US Environmental Protection Agency, EPA-230–05–89–051, Washington, DC.
3. An ice-cover climatology for lake erie and lake superior for the winter seasons 1897–1898 to 1982–1983