Found in articles
Shorelines of the Great Lakes Great Lakes Water Levels Archived 2013-04-18 at the Wayback Machine., published by the US Army Corps of Engineers. The link
designing and acquiring the system on behalf of the United States Government. U.S. Army Corps of Engineers manual: NAVSTAR HTML at the Wayback Machine
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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
bulletin of Lake Levels for The Great Lakes; September 2009; U.S. Army Corps of Engineers, Detroit District "Great Lakes Map". Michigan Department of Natural
Guide, and Reference Book, U.S. Government Printing Office, 1938, OCLC 59803706 Army Art of World War I, U.S. Army Center of Military History: Smithsonian