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current | 19:37, 6 July 2020 | 1,815 × 859 (417 KB) | Pi3.124 | Uploaded a work by EDWARD ORTON from THE TRENTON LIMESTONE AS A SOURCE OF PETROLEUM AND INFLAMMABLE GAS IN OHIO AND INDIANA, in Eighth Annual report of the United States Geological Survey to the Secretary of the Interior, 1886-1887: Part 2 with UploadWizard |
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