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Keywords from Image Description:
Production cumule des Mines du Boulonnais. Mines du Boulonnais Document extrait de tude des Gtes Minraux de la France Topographie Souterraine du Bassin Houiller du Boulonnais ou Bassin d'Hardinghen par Olry ingnieur en chef des Mines fr AlbertCharles Olry Topographie souterraine du bassin houiller du Boulonnais ou bassin d'Hardinghen