Shows the Lake Superior region. Relief shown by hachures; depths shown by soundings. "Engraved by J. Farmer." "Entered according to act of Congress...the 8th day of July 1847 by John Farmer." "Entered according to act of Congress...on the 6th day of March A.D. 1849 by John Farmer." Insets: Map of the surveyed part of Min[n]esota -- Map of Beaver Islands -- Plat of Isle Royale. 1 map: hand col.; 50 x 101 cm