Spatial Coverage: Minnesota. / Year: 1887 - Yale University Library GeoBlacklight Search Results

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1. Preliminary geological map of the iron bearing rocks of the northeastern part of Minnesota based on the field notes of N.H. Winchell in 1878, 1879 and 1886, and of A. Winchell in 1886. [cartographic material]

1887. 2002-06-01T04:00:00Z. 2017-03-07T22:14:42Z. Winchell, N. H. (Newton Horace), 1839-1914. Geological and Natural History Survey of Minnesota. English. cartographic image. Public. Minnesota and Minnesota.

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1. Preliminary geological map of the iron bearing rocks of the northeastern part of Minnesota based on the field notes of N.H. Winchell in 1878, 1879 and 1886, and of A. Winchell in 1886. [cartographic material]

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