1. 1
   The bacterial purification of sewage, being a practical account of the various modern biological methods of purifying sewage

   by Barwise, Sidney
   Published 1901

   London, C. Lockwood and Son, 1901.

   4 preliminary leaves, 48 pages, 6 plates illustrations.

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2. 2
   Novo processo de depuração das águas

   by Moncorvo Filho, Arthur
   Published 1893

   1893.

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