The 1836 boundary description between Wisconsin and Michigan described the line through northwest Lake Michigan as "the most usual ship channel". This description needed clarification as two routes were in use into Green Bay. Four islands lay in between and all were claimed as part of both Door County, Wisconsin, and Delta County, Michigan. A similar case, Michigan v. Wisconsin 270 U.S. 295 (1926), had previously been brought to the Supreme Court but was dismissed.
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. Washington, DC: Blair & Rives, Printers. 1841. Senate Document no. 151, 26th Congress, 2d session.
United States Army Corps of Topographical Engineers (1842). 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. Washington, DC: Thomas Allen, Printers. Senate Document no. 170, 27th Congress, 2d session.
Martin, Lawrence (September 1930). "The Michigan–Wisconsin Boundary Case in the Supreme Court of the United States, 1923–26". Annals of the Association of American Geographers. Vol. 20 no. 3. pp. 106–163.