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

   by Richards, Ellen H. (Ellen Henrietta), 1842-1911
   Published 1900

   New York, Wiley, 1900.

   226 p. illus. 24cm.

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2. 2
   Air, water, and food from a sanitary standpoint

   by Richards, Ellen H. (Ellen Henrietta), 1842-1911
   Published 1909

   New York, Wiley, 1909.

   278 p. illus., plate, fold. map. 24 cm.

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