Maryland Chrome Mines. Map published by the Maryland Geological Survey in 1928. The 1928 color plate appears to have been derived from maps created as early as 1919 and published in articles on Maryland’s chrome industry.

Maryland Chrome Mines. Map published by the Maryland Geological Survey in 1928. The 1928 color plate appears to have been derived from maps created as early as 1919 and published in articles on Maryland’s chrome industry.

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