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Are you Robert Strong Lewis, author of the books below?
Elements of Mining by Robert Strong Lewis Mine Sampling And The Commercial Value Of Ores by Robert Strong Lewis The Mineral Industry Of Utah by Robert Strong Lewis Patents relating to oil-flotation processes, by Robert Strong Lewis Elements of Mining by Robert Strong Lewis Patents relating to oil-flotation processes 1916 [Leather Bound] by Robert Strong Lewis The Mineral Industry of Utah by Robert Strong Lewis Condensed mining handbook of Utah by Robert Strong Lewis Bulletin Of The Utah Engineering Experiment Station, Issues 1... by Thomas M. Varley


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