Color print advertisement for Dow Ferric Chloride, a conditioning agent used to extract organic matter from water. The advertisement features illustrated depictions of various historic civilizations and details the use of Dow Ferric Chloride to aid the removal and disposal of waste.
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Dow Chemical Company. “The Cities Men Build,” 1940. Advertisements from the Dow Chemical Historical Collection, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/gf06g3784.
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