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File:Basaltic columns Lake Superior.png

Summary

Description
English: Columns of basalt on the northwest shore of Lake Superior
Date 1849
Source Owen, David Dale (1852) Report of a Geological Survey of Wisconsin, Iowa, and Minnesota, Philadelphia: Lippingcott, Grambo & Co., p. 384 Retrieved on 14 June 2012.
Author Sketch by Richard Owen, engraved by J. W. Orr, on wood by S. Wade

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