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Square set system of timbering as employed by the Shannon Copper Co.Hoffman, Ray Eugene. January 1908 (has links) (PDF)
Thesis--University of Missouri, School of Mines and Metallurgy, 1908. / R. E. Hoffman determined to be Ray Eugene Hoffman from "Forty-First Annual Catalogue. School of Mines and Metallurgy, University of Missouri". The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed February 26, 2009)
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