The 1836 boundary description described the line through northwest Lake Michigan as “the most usual ship channel”. This description needed clarification as two routes were in use. A 1926 Supreme Court decision chose the northernmost ship channel, in which Michigan lost the intervening water area and four islands: Plum, Detroit, Washington, and Rock.
Captain Cram's reports were printed in: Message from the President of the United States, in compliance with a resolution from the Senate in relation to the survey to ascertain and designate the boundary-line between the state of Michigan and the territory of Wiskonsin. Senate Document no. 151, 26th Congress, 2d session. Washington, D.C. : Blair & Rives, Printers, 1841
United States Army. Corps of Topographical Engineers. Report of the Secretary of War: communicating, in compliance with a resolution of the Senate, a copy of the report of the survey of the boundary between the state of Michigan and the territory of Wisconsin. Senate Document no. 170, 27th Congress, 2d session. Washington, D.C. : Thomas Allen, Printers, 1842
Martin, Lawrence. "The Michigan-Wisconsin Boundary Case in the Supreme Court of the United States, 1923-26" in Annals of the Association of American Geographers, v. 20, no. 3 (September 1930), p. 106-163.
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