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![Report on the Geology of the County of Londonderry, and of parts of Tyrone and Fermanagh. [With maps and plates.] by Joseph Ellison Portlock](https://d3fa68hw0m2vcc.cloudfront.net/images/autosize/24919806.jpeg?width=228&height=285&format=jpeg "Report on the Geology of the County of Londonderry, and of parts of Tyrone and Fermanagh. [With maps and plates.] by Joseph Ellison Portlock")
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Joseph Ellison Portlock