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Thesis... on the relative effieciency of certain filters for removing micro-organisms from water, with special reference to the Nordtmeyer-Berkefeld and Pasteur-Chamberland filters / by H. H. Johnston.

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Johnston, H. H.

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Thesis... on the relative effieciency of certain filters for removing micro-organisms from water, with special reference to the Nordtmeyer-Berkefeld and Pasteur-Chamberland filters / by H. H. Johnston.