File:Henri-Georges Doll - Fig. 2 François Conrad Schlumberger pursuing his experiments on the sedimentary iron deposits of Normandy wearing a telephone headset.jpg
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Henri-Georges_Doll_-_Fig._2_François_Conrad_Schlumberger_pursuing_his_experiments_on_the_sedimentary_iron_deposits_of_Normandy_wearing_a_telephone_headset.jpg (546 × 433 pixels, file size: 101 KB, MIME type: image/jpeg)
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