Cartographic Details: Scale approximately 1:330,000 (W 92°1'--W 89°30'/N 48°14'--N 47°3'). Relief shown by hachures. Cover title: Winchell's Geological map of the iron-bearing rocks of northeastern Minnesota. -- Advance copy. Includes descriptive text inside cover. 18 x 76 centimeters on sheet 20 x 74 centimeters 1:330,000 General Minnesota Maps
Creator:
Geological and Natural History Survey of Minnesota, Winchell, Alexander, 1824-1891, and Winchell, N. H. (Newton Horace), 1839-1914
Publisher:
Geological and Natural History Survey of Minnesota ; St. Paul, Minnesota