LC Subject Heading: Slate
Mayfield Slate Quarry, Skowhegan
Contributed by: Skowhegan History House
Date: 1860 - 1870
Monson-Maine Slate Company mill
Contributed by: Monson Historical Society
Date: circa 1920
Media: Photographic print
Slate, greenstone trap-rocks, Quoddy-Head, 1836
Contributed by: Maine Historical Society
Media: Ink on paper
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