Image: Indiana-Ohio oil and gas fields
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Description: Indiana-Ohio oil and gas fields
Title: Indiana-Ohio oil and gas fields
Credit: 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, https://pubs.er.usgs.gov/publication/ar8_2
Author: EDWARD ORTON
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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