concept

Franco-Prussian War: soldiers using the new army filter-van. Wood engraving.

Schuylkill Water Works, Philadelphia: panoramic view with the river. Coloured engraving by J.C. Armytage after W.H. Bartlett.

A few words on the art of filtration / by P.A. Maignen.

Professor Koch on the bacteriological diagnosis of cholera, water-filtration and cholera, and the cholera in Germany during the winter of 1892-93 / tr. by George Duncan ; with prefatory note by W.T. Gairdner.

Some of the characters of coagulated and mechanically-filtered water / by Sheridan Delépine.

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Water - Purification - Filtration

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Schuylkill Water Works, Philadelphia: panoramic view with the river. Coloured engraving by J.C. Armytage after W.H. Bartlett.

A few words on the art of filtration / by P.A. Maignen.

Professor Koch on the bacteriological diagnosis of cholera, water-filtration and cholera, and the cholera in Germany during the winter of 1892-93 / tr. by George Duncan ; with prefatory note by W.T. Gairdner.

Franco-Prussian War: soldiers using the new army filter-van. Wood engraving.

Some of the characters of coagulated and mechanically-filtered water / by Sheridan Delépine.