Category:Air, water, and food from a sanitary standpoint (1900)

Media in category "Air, water, and food from a sanitary standpoint (1900)"

The following 2 files are in this category, out of 2 total.

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  Air, water, and food from a sanitary standpoint (1900) (14579270700).jpg 3,096 × 1,884; 1.74 MB
  
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  Air, water, and food from a sanitary standpoint (IA airwaterfoodf00rich).pdf 783 × 1,354, 246 pages; 15.54 MB