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You searched for: Author Geological and Natural History Survey of Minnesota. Remove constraint Author: Geological and Natural History Survey of Minnesota. Subject Geological maps Remove constraint Subject: Geological maps Institution Minnesota Remove constraint Institution: Minnesota Data type Image Remove constraint Data type: Image
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1. Preliminary geological map of the iron bearing rocks of the northeastern part of Minnesota

1887. Winchell, Newton Horace and Geological and Natural History Survey of Minnesota. Scale approximately 1:330,000 (W 92°41ʹ--W 89°30ʹ/N 48°14ʹ--N 47°43ʹ). Relief shown by hachures. Cover title: Winchell's Geological map of the iron...