Slate - Wikipedia, The Free Encyclopedia
John T F Turner - A Familiar Description of the Old Delabole Slate Quarries, 1864; Granville Slate Museum; Hower’s Lightning Slate Reckoner (1884/1904), by F. M. Hower, Cherryville, Penn., on Stone Quarries and Beyond (PDF/18.95 MB) v; t; e; Stonemasonry. Types: Masonry; Ashlar; Monumental; ... Read Article
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