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blue mounds

geological cross sections

geological maps

geological section

geology

illinois

iowa

lionel pincus and princess firyal map division

maps

section line

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Geological section from the mouth of Rock River through the Blue Mounds to the Wisconsin River : in connection with a geological chart of part of Iowa, Wisconsin and Illinois, N.W. of the section line

Geological section from the mouth of Rock River through the Blue Mound...

Public domain scan of a architecture diagram, settlement map, plan, or drawing, free to use, no copyright restrictions - Picryl description.