Winchell, Newton Horace, 1839-1914, Winchell, Alexander, 1824-1891, and Geological and Natural History Survey of Minnesota.
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. Dimensions: 18 x 76 centimeters on sheet 20 x 74 centimeters
Geological and Natural History Survey of Minnesota
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