Summary narrative of an exploratory expedition to the sources of the Mississippi River, in 1820 : resumed and completed, by the discovery of its origin in Itasca Lake, in 1832 / by authority of the United States : with appendixes, comprising the original report on the copper mines of Lake Superior, and observations on the geology of the lake basins, and the summit of the Mississippi, together with all the official reports and scientific papers of both expeditions ; by Henry R. Schoolcraft.