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Keywords from Image Description:
Emplacement des failles des sondages et des principaux puits. Mines du Boulonnais Mines du Boulonnais et de leur gologie Informations complmentaires sur l'article Mines du Boulonnais fr AlbertCharles Olry Topographie souterraine du bassin houiller du Boulonnais ou bassin d'Hardinghen Imprimerie Nationale Paris Creator Albert Olry