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dyvroeth: Limestone flooring
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dyvroeth: St Michael triumphs over the Devil
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dyvroeth: River Thames mud
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dyvroeth: Cliff face near Godrevy
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dyvroeth: Cliff face near Godrevy
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dyvroeth: Hornchurch Cutting SSSI
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dyvroeth: Crown's Mine engine houses at Botallack
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dyvroeth: Levant Mine
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dyvroeth: Mammoth
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dyvroeth: King Coal, Museu de Geologia
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dyvroeth: Charnockite - Verde Ubatuba
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dyvroeth: Porkkala Granite
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dyvroeth: Indiana Limestone
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dyvroeth: Briar Hill Sandstone
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dyvroeth: Green Slate
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dyvroeth: Jura Marble
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dyvroeth: Jura Marble
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dyvroeth: garnetiferous granite
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dyvroeth: hypersthene granodiorite
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dyvroeth: Cherokee Marble
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dyvroeth: Hoover Dam
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dyvroeth: Lake Mead
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dyvroeth: Black Canyon
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dyvroeth: Fubarite, near Black Canyon
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dyvroeth: Hoover Dam
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dyvroeth: Lake Mead
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dyvroeth: Hoover Dam face
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dyvroeth: Owens Lake
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dyvroeth: old quarry
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dyvroeth: Death Valley