"Lakes Michigan and Huron are considered to be one lake, as they rise and fall together due to their union at the Straits of Mackinac." U.S. Army Corps of Engineers, "Hydrological Components" Record Low Water Levels Expected on Lake SuperiorArchived 2008-10-15 at the Wayback Machine. August 2007. p.6
"Protected Areas Programme". United Nations Environment Programme, World Conservation Monitoring Centre, UNESCO. October 1995. Archived from the original on 2008-05-11. Retrieved 2008-06-26.
"Lakes Michigan and Huron are considered to be one lake, as they rise and fall together due to their union at the Straits of Mackinac." U.S. Army Corps of Engineers, "Hydrological Components" Record Low Water Levels Expected on Lake SuperiorArchived 2008-10-15 at the Wayback Machine. August 2007. p.6
"Protected Areas Programme". United Nations Environment Programme, World Conservation Monitoring Centre, UNESCO. October 1995. Archived from the original on 2008-05-11. Retrieved 2008-06-26.