The mineral region of Lake Superior: comprising its early history, those parts of Dr. Douglass Houghton's Reports of 1841 and '42 relating to the mineralogy of the district; the reports of the linear and geological surveys of 1845; a notice of mining companies--their officers and locations; with an accurate list of locations and leases up to July 17, 1846; and a variety of statistical information ... accompanied by the corrected map of the mineral agency office and chart of Lake Superior.