The final series consists of a large collection of maps, including stope maps, surface maps, and progress maps of Bunker Hill properties as well as maps of the Coeur d'Alene mining district. Of particular interest is a map of the Coeur d'Alene mining district drawn by Henry C. Ihrig and copyrighted by Adam Aulbach in 1899 (T-17 2712). A few maps were small enough to be folded and placed in folders; these include maps of building locations for the smelter, zinc reduction plant, research laboratory and gas plant, mine and mill properties and fertilizer plant. Other foldered maps are fire maps showing gas shut off valves, fire alarms, Grinnell valves and alarms, and fire hydrants for the smelter, mine plant, zinc plant, and phosphate plant and research lab. A majority of the maps are rolled and are stored in tall boxes. They are arranged by the Bunker Hill number. An asterisk (*) preceding the description indicates that the map was too large to be removed from the box which it was originally stored upon receipt by the library. A double asterisk (**) preceding the description indicates that the map is very large and mounted on cloth; these maps were difficult to handle and are not stored in numerical sequence.