General connected section of the rocks exposed on the North shore of Lake Superior between Fond du Lac Superieur and Pigeon Point, as observed during the geological surveys of Wisconsin & Minnesota territory, in the year 1848, 49 & 50, under the direction of David Dale Owen, M.D. United States Geologist. By Richard Owen. (to accompany) Illustrations to the Geological Report of Wisconsin, Iowa, and Minnesota. (with) Report of a Geological Survey of Wisconsin, Iowa and Minnesota ... 1852.
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General connected section of the rocks exposed on the North shore of Lake Superior between Fond du Lac Superieur and Pigeon Point, as observed during the geological surveys of Wisconsin & Minnesota territory, in the year 1848, 49 & 50, under the direction of David Dale Owen, M.D. United States Geologist. By Richard Owen. (to accompany) Illustrations to the Geological Report of Wisconsin, Iowa, and Minnesota. (with) Report of a Geological Survey of Wisconsin, Iowa and Minnesota ... 1852.
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