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Keywords from Image Description:
Mines du Boulonnais Carte gologique des terrains primaires du Boulonnais. Mines du Boulonnais fr AlbertCharles Olry Topographie souterraine du bassin houiller du Boulonnais ou bassin d'Hardinghen Imprimerie Nationale Paris Creator Albert Olry PDold Mines du Boulonnais Geological maps of France