A true description of the Lake Superior country : its rivers, coasts, bays, harbours, islands, and commerce : with Bayfield's chart, <showing the boundary line as established by Joint commission> : also a minute account of the copper mines and working companies : accompanied by a map of the mineral regions : showing, by their no. and place, all the different locations : and containing a concise mode of assaying, treating, smelting, and refining copper ores /