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Stone description: roofing and tile slate

Wall Number Sort descending Country State Classification Source
10RB20 United States Pennsylvania Argillite (Slate) Slatington
10RB21 United States Pennsylvania Argillite (Slate) Slatington
6LB15 United States Pennsylvania Argillite (Slate) Slatington
7LA17 United States Pennsylvania Argillite (Slate) Slatington
7RA17 United States Pennsylvania Argillite (Slate) Slatedale