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FRANKLAND.—MICRO-ORGANISMS IN WATER. Together with an Account of the Bacteriological Methods involved in their Investigation. Specially designed for the use of those connected with the Sanitary Aspects of Water-Supply. By Percy Frankland, Ph.D., B.Sc. (Lond.), F.R.S., and Mrs. Percy Frankland. With 2 Plates and Numerous Diagrams. 8vo., 16s. net.

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ZOOLOGÍA DE LOS ANIMALES INVERTEBRADOS.

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