Sub-Indian agent at La Pointe, Wisconsin, later surveyor of Indian lands in Michigan's Upper Peninsula, and interpreter among the Chippewa Indians. Letters relating to his work among the Indians, also including descriptions of Michigan's copper deposits and of Johnston's efforts to exploit the area's natural resources.
The George Johnston letterbook provides a chronology of the events in his life. Included are copies of letters from Chippewa Indian chiefs appealing to the President of the United States to honor its past treaties with the Indians. There are also many letters describing the copper deposits of Michigan's Upper Peninsula, including letters to copper mining companies (i.e. the Native Copper Association and the Bruce Mining Company) urging them to exploit the natural resources of the Upper Peninsula. Letters to Henry Schoolcraft, Johnston's brother-in-law, indicate something of his interest in Michigan's copper resources. Of interest are the series of letters written to Secretary of War, Lewis Cass, Henry R. Schoolcraft, and H.C. Gilbert defending his claim to receive land under the treaty of 1855. Johnston addressed letters to the following individuals: Lewis Cass, Zachariah Chandler, Peter Dougherty, Bishop Samuel McCoskry, Robert McClelland, Henry R. Schoolcraft, Charles Stuart, and C.C. Trowbridge.