1. 1
   Air, water, and food from a sanitary standpoint

   by Richards, Ellen H. (Ellen Henrietta), 1842-1911
   Published 1904

   New York, J. Wiley, 1904.

   1 online resource (262 p.) illus., plates, maps.

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2. 2
   Novo processo de depuração das águas

   by Moncorvo Filho, Arthur
   Published 1893

   1893.

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