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Circle Genealogic and Historic Champanellois Association "Law 1901" of Saint-Genès-Champanelle, 63 , France |
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Circle Genealogic and Historic Champanellois Association "Law 1901" of Saint-Genès-Champanelle, 63 , France |
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Quarry of pouzzolane at the bottom of Puy de la vache
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| By place, according to rate's of oxidation reached, pozzolana takes a blach colour. |
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