Volume 7:

93. The Mississippi River and Its Source; a narrative and critical history of the river and its headwaters, accompanied by the results of detailed hydrographic and topographic surveys; illustrated with many maps, portraits and views of the scenery; by Hon. J. V. Brower, Commissioner of the Itasca State Park, representing also the State Historical Society. With an appendix: How the Mississippi River and the Lake of the Woods became instrumental in the establishment of the northwestern boundary of the United States, by Alfred J. Hill.