File:BOILLOT(1899) p217 EXPLOITATION D'UN PLACER PAR LA MÉTHODE HYDRAULIQUE.-PHOTOGRAPHIE DE LA ROCHE À SEATTLE.jpg
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![File:BOILLOT(1899) p217 EXPLOITATION D'UN PLACER PAR LA MÉTHODE HYDRAULIQUE.-PHOTOGRAPHIE DE LA ROCHE À SEATTLE.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/BOILLOT%281899%29_p217_EXPLOITATION_D%27UN_PLACER_PAR_LA_M%C3%89THODE_HYDRAULIQUE.-PHOTOGRAPHIE_DE_LA_ROCHE_%C3%80_SEATTLE.jpg/800px-BOILLOT%281899%29_p217_EXPLOITATION_D%27UN_PLACER_PAR_LA_M%C3%89THODE_HYDRAULIQUE.-PHOTOGRAPHIE_DE_LA_ROCHE_%C3%80_SEATTLE.jpg?20140605174309)
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